blob: 69be581e7c7ac9fdc2323230d241e1b6ced31f80 [file] [log] [blame]
Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvalds6ff33f32015-09-12 16:35:56 -07002PATCHLEVEL = 3
Linus Torvalds55922c92011-05-29 17:43:36 -07003SUBLEVEL = 0
Linus Torvalds6a13feb2015-11-01 16:05:25 -08004EXTRAVERSION =
Linus Torvalds25cb62b2015-10-11 11:09:45 -07005NAME = Blurry Fish Butt
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
Masahiro Yamadaa436bb72015-03-27 20:43:36 +090013# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
H. Peter Anvinc0513462009-12-17 06:56:11 -080018# Avoid funny character set dependencies
H. Peter Anvin06b5dc62009-12-17 15:51:37 -080019unexport LC_ALL
H. Peter Anvinc0513462009-12-17 06:56:11 -080020LC_COLLATE=C
21LC_NUMERIC=C
Michal Marek07105202010-01-08 12:25:37 +010022export LC_COLLATE LC_NUMERIC
H. Peter Anvinc0513462009-12-17 06:56:11 -080023
Borislav Petkovab7474e2013-11-11 15:27:43 +010024# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
Michal Marek066b7ed2014-07-04 14:29:30 +020043# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
Linus Torvalds1da177e2005-04-16 15:20:36 -070066# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
Cheng Renquanb8b06182009-05-26 16:03:07 +080069ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
Michal Marek066b7ed2014-07-04 14:29:30 +020076ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200104#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122endif
123
124# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500125PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126_all:
127
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131ifneq ($(KBUILD_OUTPUT),)
132# Invoke a second make in the output directory, passing relevant variables
133# check that the output directory actually exists
134saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900138 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Milton Miller0b357862007-09-21 18:09:02 -0500140PHONY += $(MAKECMDGOALS) sub-make
141
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100143 @:
Milton Miller0b357862007-09-21 18:09:02 -0500144
145sub-make: FORCE
Masahiro Yamada745a2542014-09-09 20:02:23 +0900146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/sparse.txt" for more details, including
170# where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188endif
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190# If building an external module we do not care about the all: rule
191# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500192PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193ifeq ($(KBUILD_EXTMOD),)
194_all: all
195else
196_all: modules
197endif
198
Michal Marek9da07632014-04-25 23:25:18 +0200199ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200210objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211src := $(srctree)
212obj := $(objtree)
213
Mattia Dongili0f558c32006-02-19 13:50:37 +0100214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Amerigo Wang11294232009-06-19 03:40:26 -0400216export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218# SUBARCH tells the usermode build what the underlying arch is. That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below. If a native build is happening,
Masahiro Yamada38385f82014-04-28 16:26:18 +0900221# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222# SUBARCH is subsequently ignored.
223
David Woodhouseffee0de2012-12-20 21:51:55 +0000224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225 -e s/sun4u/sparc64/ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
Will Deaconf1b99392013-01-18 19:00:47 +0000229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231# Cross compiling and selecting different set of gcc/bin-utils
232# ---------------------------------------------------------------------------
233#
234# When performing cross compilation for other architectures ARCH shall be set
235# to the target architecture. (See arch/* for the possibilities).
236# ARCH can be set during invocation of make:
237# make ARCH=ia64
238# Another way is to have ARCH set in the environment.
239# The default ARCH is the host where make is executed.
240
241# CROSS_COMPILE specify the prefix used for all executables used
242# during compilation. Only gcc and related bin-utils executables
243# are prefixed with $(CROSS_COMPILE).
244# CROSS_COMPILE can be set on the command line
245# make CROSS_COMPILE=ia64-linux-
246# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800247# A third alternative is to store a setting in .config so that plain
248# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249# Default value for CROSS_COMPILE is not to prefix executables
250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200251ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Sam Ravnborgd746d642007-11-12 20:14:19 +0100258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260 SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200265
Sam Ravnborg5e538792008-12-02 23:17:12 -0800266# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000267ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200270ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800271 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200272endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200273
Paul Mundt3cc000b2009-04-11 08:39:27 +0900274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277endif
278
Chris Metcalf18aecc22011-05-04 14:38:26 -0400279# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400280ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400283ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285endif
286
Sam Ravnborg5e538792008-12-02 23:17:12 -0800287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700290KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500291export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293# SHELL used by kbuild
294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
297
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200298HOSTCC = gcc
299HOSTCXX = g++
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200301HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Behan Webster61163ef2013-09-03 22:27:23 -0400303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333endif
334
Sam Ravnborge579d352005-07-27 08:10:10 +0200335export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100338# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900339scripts/Kbuild.include: ;
340include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343AS = $(CROSS_COMPILE)as
344LD = $(CROSS_COMPILE)ld
345CC = $(CROSS_COMPILE)gcc
346CPP = $(CC) -E
347AR = $(CROSS_COMPILE)ar
348NM = $(CROSS_COMPILE)nm
349STRIP = $(CROSS_COMPILE)strip
350OBJCOPY = $(CROSS_COMPILE)objcopy
351OBJDUMP = $(CROSS_COMPILE)objdump
352AWK = awk
353GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200354INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900357PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358CHECK = sparse
359
Hannes Eder80a7d1d92008-12-27 22:38:44 +0100360CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
Sam Ravnborg65881692010-07-28 17:33:09 +0200362CFLAGS_MODULE =
363AFLAGS_MODULE =
364LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365CFLAGS_KERNEL =
366AFLAGS_KERNEL =
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700367CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369
David Howellsabbf1592012-10-02 18:01:26 +0100370# Use USERINCLUDE when you must reference the UAPI directories only.
371USERINCLUDE := \
372 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
373 -Iarch/$(hdr-arch)/include/generated/uapi \
374 -I$(srctree)/include/uapi \
375 -Iinclude/generated/uapi \
376 -include $(srctree)/include/linux/kconfig.h
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378# Use LINUXINCLUDE when you must reference the include/ directory.
379# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100380LINUXINCLUDE := \
381 -I$(srctree)/arch/$(hdr-arch)/include \
Michal Marek90ac0862015-01-08 16:16:39 +0100382 -Iarch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100383 -Iarch/$(hdr-arch)/include/generated \
384 $(if $(KBUILD_SRC), -I$(srctree)/include) \
385 -Iinclude \
386 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100388KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200390KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700391 -fno-strict-aliasing -fno-common \
Floris Kraaka8735822009-06-15 08:54:02 +0300392 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300393 -Wno-format-security \
394 -std=gnu89
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200395
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200396KBUILD_AFLAGS_KERNEL :=
397KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg222d3942007-10-15 21:59:31 +0200398KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborg65881692010-07-28 17:33:09 +0200399KBUILD_AFLAGS_MODULE := -DMODULE
400KBUILD_CFLAGS_MODULE := -DMODULE
401KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700403# Read KERNELRELEASE from include/config/kernel.release (if it exists)
404KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200405KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100406
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200407export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100408export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200409export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900410export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200411export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Sam Ravnborg06c50402007-10-15 22:17:25 +0200413export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -0800414export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200415export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200416export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200417export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200418export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420# When compiling out-of-tree modules, put MODVERDIR in the module
421# tree rather than in the kernel tree. The kernel tree might
422# even be read-only.
423export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425# Files to ignore in find ... statements
426
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500427export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
428 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
429 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100430export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
431 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433# ===========================================================================
434# Rules shared between *config targets and build targets
435
436# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500437PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438scripts_basic:
439 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500440 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200442# To avoid any implicit rule to kick in, define an empty command.
443scripts/basic/%: scripts_basic ;
444
Paul Smith4f193362006-03-05 17:14:10 -0500445PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200446# outputmakefile generates a Makefile in the output directory, if using a
447# separate output directory. This allows convenient use of make in the
448# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200450ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100451 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
453 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
454endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200456# Support for using generic headers in asm-generic
457PHONY += asm-generic
458asm-generic:
459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100460 src=asm obj=arch/$(SRCARCH)/include/generated/asm
461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
462 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464# To make sure we do not include .config for any of the *config targets
465# catch them early, and hand them over to scripts/kconfig/Makefile
466# It is allowed to specify more targets when calling make, including
467# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200468# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469# Detect when mixed targets is specified, and make a second invocation
470# of make so .config is not included in this case either (for *config).
471
David Howells10b63952012-10-02 18:01:57 +0100472version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100473old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100474
Roman Zippel3eb3c742007-01-10 14:45:28 +0100475no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100476 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100477 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700478 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480config-targets := 0
481mixed-targets := 0
482dot-config := 1
483
484ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
485 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
486 dot-config := 0
487 endif
488endif
489
490ifeq ($(KBUILD_EXTMOD),)
491 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
492 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900493 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 mixed-targets := 1
495 endif
496 endif
497endif
498
499ifeq ($(mixed-targets),1)
500# ===========================================================================
501# We're called with mixed targets (*config and build targets).
502# Handle them one by one.
503
Masahiro Yamada9319f452014-04-09 15:51:35 +0900504PHONY += $(MAKECMDGOALS) __build_one_by_one
505
506$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
507 @:
508
509__build_one_by_one:
510 $(Q)set -e; \
511 for i in $(MAKECMDGOALS); do \
512 $(MAKE) -f $(srctree)/Makefile $$i; \
513 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515else
516ifeq ($(config-targets),1)
517# ===========================================================================
518# *config targets only - make sure prerequisites are updated, and descend
519# in scripts/kconfig to make the *config target
520
521# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
522# KBUILD_DEFCONFIG may point out an alternative default configuration
523# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900524include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400525export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100527config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100528 $(Q)$(MAKE) $(build)=scripts/kconfig $@
529
530%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 $(Q)$(MAKE) $(build)=scripts/kconfig $@
532
533else
534# ===========================================================================
535# Build targets only - this includes vmlinux, arch specific targets, clean
536# targets and others. In general all targets except *config targets.
537
538ifeq ($(KBUILD_EXTMOD),)
539# Additional helpers built in scripts/
540# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200541# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500542PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200543scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
544 asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 $(Q)$(MAKE) $(build)=$(@)
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547# Objects we will link into vmlinux / subdirs we need to visit
548init-y := init/
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100549drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550net-y := net/
551libs-y := lib/
552core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800553virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554endif # KBUILD_EXTMOD
555
556ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200557# Read in config
558-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200560ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561# Read in dependencies to all Kconfig* files, make sure to run
562# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700563-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700566$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Roman Zippelc955cca2006-06-08 22:12:39 -0700568# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100569# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200570# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100571# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100572include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
574else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200575# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200576# but do not care if they are up-to-date. Use auto.conf to trigger the test
577PHONY += include/config/auto.conf
578
579include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200580 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200581 echo >&2; \
582 echo >&2 " ERROR: Kernel configuration is invalid."; \
583 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
584 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
585 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200586 /bin/false)
587
588endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590else
591# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700592include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200593endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595# The all: target is the default when no target is given on the
596# command line.
597# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200598# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599all: vmlinux
600
Michal Marek6dd3f132015-07-16 18:23:53 +0200601# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
602# values of the respective KBUILD_* variables
603ARCH_CPPFLAGS :=
604ARCH_AFLAGS :=
605ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900606include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200607
608KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
609
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Arnd Bergmanne74fc972013-02-15 21:23:58 +0100611KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200613KBUILD_CFLAGS += -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614endif
615
Jiri Kosina69102312014-08-06 16:08:43 -0700616# Tell gcc to never replace conditional load with a non-conditional one
617KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
618
Andi Kleen1873e872012-03-28 11:51:18 -0700619ifdef CONFIG_READABLE_ASM
620# Disable optimizations that make assembler listings hard to read.
621# reorder blocks reorders the control in the function
622# ipa clone creates specialized cloned functions
623# partial inlining inlines only parts of functions
624KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
625 $(call cc-option,-fno-ipa-cp-clone,) \
626 $(call cc-option,-fno-partial-inlining)
627endif
628
Mike Frysinger08f67462009-06-04 16:29:08 -0700629ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100630KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
631endif
632
Kees Cook19952a92013-12-19 11:35:58 -0800633# Handle stack protector mode.
Kees Cook13324292014-08-06 16:03:31 -0700634#
635# Since kbuild can potentially perform two passes (first with the old
636# .config values and then with updated .config values), we cannot error out
637# if a desired compiler option is unsupported. If we were to error, kbuild
638# could never get to the second pass and actually notice that we changed
639# the option to something that was supported.
640#
641# Additionally, we don't want to fallback and/or silently change which compiler
642# flags will be used, since that leads to producing kernels with different
643# security feature characteristics depending on the compiler used. ("But I
644# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
645#
646# The middle ground is to warn here so that the failed option is obvious, but
647# to let the build fail with bad compiler flags so that we can't produce a
648# kernel when there is a CONFIG and compiler mismatch.
649#
Kees Cook87796572013-12-19 11:35:59 -0800650ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800651 stackp-flag := -fstack-protector
652 ifeq ($(call cc-option, $(stackp-flag)),)
Jan Beulich6c15b322014-02-25 15:01:48 -0800653 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
Fathi Boudra27b2a492014-02-25 15:01:46 -0800654 -fstack-protector not supported by compiler)
Kees Cook19952a92013-12-19 11:35:58 -0800655 endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800656else
657ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800658 stackp-flag := -fstack-protector-strong
659 ifeq ($(call cc-option, $(stackp-flag)),)
660 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
661 -fstack-protector-strong not supported by compiler)
662 endif
Kees Cook19952a92013-12-19 11:35:58 -0800663else
664 # Force off for distro compilers that enable stack protector by default.
665 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900666endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800667endif
Kees Cook19952a92013-12-19 11:35:58 -0800668KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100669
Michal Marek5631d9c2015-08-19 17:36:41 +0200670ifeq ($(cc-name),clang)
Behan Webster61163ef2013-09-03 22:27:23 -0400671KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
672KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
673KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
674KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
675KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
676# Quiet clang warning: comparison of unsigned expression < 0 is always false
677KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
678# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
679# source of a reference will be _MergedGlobals and not on of the whitelisted names.
680# See modpost pattern 2
681KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700682KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Behan Webster61163ef2013-09-03 22:27:23 -0400683else
684
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400685# This warning generated too much noise in a regular build.
686# Use make W=1 to enable this warning (see scripts/Makefile.build)
Michal Marek8417da6f2011-05-02 12:51:15 +0200687KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400688endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200691KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100693# Some targets (ARM with Thumb2, for example), can't be built with frame
694# pointers. For those, we don't have FUNCTION_TRACER automatically
695# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
696# incompatible with -fomit-frame-pointer with current GCC, so we don't use
697# -fomit-frame-pointer with FUNCTION_TRACER.
698ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200699KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100701endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Linus Torvalds2062afb2014-07-26 14:52:01 -0700703KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200706ifdef CONFIG_DEBUG_INFO_SPLIT
707KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
708else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200709KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200710endif
Behan Webster22883282014-02-14 15:19:17 -0800711KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200713ifdef CONFIG_DEBUG_INFO_DWARF4
714KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
715endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200717ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800718KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
719 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200720endif
721
Steven Rostedt606576c2008-10-06 19:06:12 -0400722ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100723ifndef CC_FLAGS_FTRACE
724CC_FLAGS_FTRACE := -pg
725endif
726export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500727ifdef CONFIG_HAVE_FENTRY
728CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100730KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500731KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400732ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400733 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400734 BUILD_C_RECORDMCOUNT := y
735 export BUILD_C_RECORDMCOUNT
736 endif
737endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200738endif
739
Sam Ravnborg91341d42008-01-21 21:31:44 +0100740# We trigger additional mismatches with less inlining
741ifdef CONFIG_DEBUG_SECTION_MISMATCH
742KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
743endif
744
Sam Ravnborge8e69932005-04-30 16:51:42 -0700745# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700746NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700747CHECKFLAGS += $(NOSTDINC_FLAGS)
748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200750KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200752# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200753KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400755# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700756KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700757
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700758# conserve stack if available
759KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
760
Sergei Trofimovich80970472013-09-13 14:51:40 -0700761# disallow errors like 'EXPORT_GPL(foo);' with missing header
762KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
763
764# require functions to have arguments in prototypes, not empty 'int foo()'
765KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
766
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800767# Prohibit date/time macros, which would make the build non-deterministic
768KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
769
Michal Marek40df7592011-04-20 13:45:30 +0200770# use the deterministic mode of AR if available
771KBUILD_ARFLAGS := $(call ar-option,D)
772
Jason Baronbf5438fc2010-09-17 11:09:00 -0400773# check for 'asm goto'
774ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
775 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
Anton Blanchardc0ccf6f2015-04-09 13:51:31 +1000776 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
Jason Baronbf5438fc2010-09-17 11:09:00 -0400777endif
778
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900779include scripts/Makefile.kasan
780include scripts/Makefile.extrawarn
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900781
Michal Marek61754c12015-07-01 17:19:30 +0200782# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
783# last assignments
784KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
785KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
786KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200787
Roland McGrath18991192007-07-19 01:48:40 -0700788# Use --build-id when available.
789LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200790 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200791KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700792LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
793
David Howells5d7d18f2009-03-04 11:59:07 -0800794ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200795LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800796endif
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200799# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800# set in the environment
801# Also any assignments in arch/$(ARCH)/Makefile take precedence over
802# this default value
803export KBUILD_IMAGE ?= vmlinux
804
805#
806# INSTALL_PATH specifies where to place the updated kernel and system map
807# images. Default is /boot, but you can set it to other values
808export INSTALL_PATH ?= /boot
809
810#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000811# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
812# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
813# an argument if needed. Otherwise it defaults to the kernel install path
814#
815export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
816
817#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
819# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200820# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821#
822
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100823MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824export MODLIB
825
Theodore Ts'oac031f22006-06-21 20:53:09 -0400826#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900827# INSTALL_MOD_STRIP, if defined, will cause modules to be
828# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
829# the default option --strip-debug will be used. Otherwise,
830# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100831
Theodore Ts'oac031f22006-06-21 20:53:09 -0400832ifdef INSTALL_MOD_STRIP
833ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100834mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400835else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100836mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400837endif # INSTALL_MOD_STRIP=1
838else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100839mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400840endif # INSTALL_MOD_STRIP
841export mod_strip_cmd
842
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930843# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
844# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
845# or CONFIG_MODULE_COMPRESS_XZ.
846
847mod_compress_cmd = true
848ifdef CONFIG_MODULE_COMPRESS
849 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200850 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930851 endif # CONFIG_MODULE_COMPRESS_GZIP
852 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200853 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930854 endif # CONFIG_MODULE_COMPRESS_XZ
855endif # CONFIG_MODULE_COMPRESS
856export mod_compress_cmd
857
P J P1bf49dd2013-11-12 15:11:44 -0800858# Select initial ramdisk compression format, default is gzip(1).
859# This shall be used by the dracut(8) tool while creating an initramfs image.
860#
Jan Beulich7ac18152013-12-18 17:08:57 -0800861INITRD_COMPRESS-y := gzip
862INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
863INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
864INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
865INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
866INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800867# do not export INITRD_COMPRESS, since we didn't actually
868# choose a sane default compression above.
869# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030871ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100872$(eval $(call config_filename,MODULE_SIG_KEY))
873
874mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
Rusty Russelle2a666d2012-10-19 11:53:15 +1030875else
876mod_sign_cmd = true
877endif
878export mod_sign_cmd
879
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100882core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
885 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800886 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
888vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800889 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
891init-y := $(patsubst %/, %/built-in.o, $(init-y))
892core-y := $(patsubst %/, %/built-in.o, $(core-y))
893drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
894net-y := $(patsubst %/, %/built-in.o, $(net-y))
895libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
896libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
897libs-y := $(libs-y1) $(libs-y2)
Feng Wu37d9fe42015-09-22 16:47:29 +0800898virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200900# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200901export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Feng Wu37d9fe42015-09-22 16:47:29 +0800902export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
Sam Ravnborg95698572012-05-05 10:18:40 +0200903export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200904export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +0200905# used by scripts/pacmage/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800906export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200908vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200910# Final link of vmlinux
911 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
912quiet_cmd_link-vmlinux = LINK $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200914# Include targets which we want to
915# execute if the rest of the kernel build went well.
916vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700917ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100918 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700919endif
Mathieu Desnoyers267c4022007-10-18 23:41:07 -0700920ifdef CONFIG_SAMPLES
921 $(Q)$(MAKE) $(build)=samples
922endif
Randy Dunlap3794f3e2008-08-12 15:09:06 -0700923ifdef CONFIG_BUILD_DOCSRC
924 $(Q)$(MAKE) $(build)=Documentation
925endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800926ifdef CONFIG_GDB_SCRIPTS
927 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
928endif
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200929 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200930
Masahiro Yamada38385f82014-04-28 16:26:18 +0900931# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200933$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935# Handle descending into subdirectories listed in $(vmlinux-dirs)
936# Preset locale variables to speed up the build process. Limit locale
937# tweaks to this spot to avoid wrong language settings when running
938# make menuconfig etc.
939# Error messages still appears in the original language
940
Paul Smith4f193362006-03-05 17:14:10 -0500941PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200942$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 $(Q)$(MAKE) $(build)=$@
944
Michal Marek0d0e7712013-07-11 15:34:51 +0200945define filechk_kernel.release
946 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
947endef
948
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +0200949# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700950include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +0200951 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100952
953
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200955# or the modules are listed in "prepare".
956# A multi level approach is used. prepareN is processed before prepareN-1.
957# archprepare is used in arch Makefiles and when processed asm symlink,
958# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200960# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500961PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200962
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200963# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964# and if so do:
965# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700966prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -0500968 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700969 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +0200970 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
971 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 /bin/false; \
973 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974endif
975
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200976# prepare2 creates a makefile if using a separate output directory
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200977prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
David Howellsd183e6f2012-10-02 18:01:56 +0100979prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +0200980 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +0200981 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
H. Peter Anvin6520fe52012-05-08 21:22:24 +0300983archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200984
985prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200986 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200987
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988# All the preparing..
Robert P. J. Dayd395efb2007-02-14 00:33:01 -0800989prepare: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991# Generate some files
992# ---------------------------------------------------------------------------
993
994# KERNELRELEASE can change from a few different places, meaning version.h
995# needs to be updated, so this check is forced on all builds
996
997uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200998define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001000 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 exit 1; \
1002 fi; \
1003 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004endef
1005
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001006define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001007 (echo \#define LINUX_VERSION_CODE $(shell \
1008 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001009 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010endef
1011
David Howellsd183e6f2012-10-02 18:01:56 +01001012$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001014 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Sam Ravnborg273b2812009-10-18 00:52:28 +02001016include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001017 $(call filechk,utsrelease.h)
1018
Vegard Nossum179efcb2008-12-16 12:33:43 +01001019PHONY += headerdep
1020headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001021 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1022 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001025# Firmware install
1026INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1027export INSTALL_FW_PATH
1028
1029PHONY += firmware_install
1030firmware_install: FORCE
1031 @mkdir -p $(objtree)/firmware
1032 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1033
1034# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001035# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001036
Sam Ravnborge6883b12008-06-05 16:43:46 +02001037#Default location for installed headers
1038export INSTALL_HDR_PATH = $(objtree)/usr
1039
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001040# If we do an all arch process set dst to asm-$(hdr-arch)
1041hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001042
H. Peter Anvin052ad272011-11-17 13:17:35 -08001043PHONY += archheaders
1044archheaders:
1045
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001046PHONY += archscripts
1047archscripts:
1048
Sam Ravnborge6883b12008-06-05 16:43:46 +02001049PHONY += __headers
David Howellsd183e6f2012-10-02 18:01:56 +01001050__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
Mike Waychisone1b702c2011-03-14 23:34:25 -07001051 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001052
1053PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001054headers_install_all:
1055 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001056
David Woodhouse8d730cf2006-06-18 11:58:39 +01001057PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001058headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001059 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1060 $(error Headers not exportable for the $(SRCARCH) architecture))
1061 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1062 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001063
Mike Frysinger1f857122007-02-14 00:33:02 -08001064PHONY += headers_check_all
1065headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001067
David Woodhouse68475352006-06-18 12:02:10 +01001068PHONY += headers_check
1069headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001070 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1071 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001072
David Woodhouse8d730cf2006-06-18 11:58:39 +01001073# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001074# Kernel selftest
1075
1076PHONY += kselftest
1077kselftest:
1078 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1079
1080# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081# Modules
1082
1083ifdef CONFIG_MODULES
1084
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001085# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Michal Marek73d13932010-03-10 12:28:58 +01001087all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001089# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001090#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001091# A module can be listed more than once in obj-m resulting in
1092# duplicate lines in modules.order files. Those are removed
1093# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Paul Smith4f193362006-03-05 17:14:10 -05001095PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001096modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001097 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001098 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Michal Mareka6c36632010-03-08 10:07:12 +01001102modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1103 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1104
Michal Marek73d13932010-03-10 12:28:58 +01001105%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001106 $(Q)$(MAKE) $(modbuiltin)=$*
1107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
1109# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001110PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001111modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
1113# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001114PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115modules_install: _modinst_ _modinst_post
1116
Paul Smith4f193362006-03-05 17:14:10 -05001117PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001118_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 @rm -rf $(MODLIB)/kernel
1120 @rm -f $(MODLIB)/source
1121 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001122 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1124 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001125 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001127 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001128 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001129 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001131# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132# boot a modules.dep even before / is mounted read-write. However the
1133# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001134PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001135_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001137 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
Josh Boyerd890f512012-11-05 09:09:24 +10301139ifeq ($(CONFIG_MODULE_SIG), y)
1140PHONY += modules_sign
1141modules_sign:
1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1143endif
1144
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145else # CONFIG_MODULES
1146
1147# Modules not configured
1148# ---------------------------------------------------------------------------
1149
1150modules modules_install: FORCE
Michal Marek5369f552012-07-07 23:04:40 +02001151 @echo >&2
1152 @echo >&2 "The present kernel configuration has modules disabled."
1153 @echo >&2 "Type 'make config' and enable loadable module support."
1154 @echo >&2 "Then build a kernel with module support enabled."
1155 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 @exit 1
1157
1158endif # CONFIG_MODULES
1159
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160###
1161# Cleaning is done on three levels.
1162# make clean Delete most generated files
1163# Leave enough to build external modules
1164# make mrproper Delete the current configuration, and all generated files
1165# make distclean Remove editor backup files, patch leftover files and the like
1166
1167# Directories & files removed with 'make clean'
1168CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
1170# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001171MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001172 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001173MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301174 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001175 signing_key.pem signing_key.priv signing_key.x509 \
1176 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001177 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
1179# clean - Delete most, but leave enough to build external modules
1180#
1181clean: rm-dirs := $(CLEAN_DIRS)
1182clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001183clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
Pawel Mollbd1ee802012-10-29 11:23:02 +00001185PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186$(clean-dirs):
1187 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1188
Pawel Mollbd1ee802012-10-29 11:23:02 +00001189vmlinuxclean:
1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1191
1192clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
1194# mrproper - Delete all generated files, including .config
1195#
1196mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1197mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1198mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199
Paul Smith4f193362006-03-05 17:14:10 -05001200PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201$(mrproper-dirs):
1202 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203
1204mrproper: clean archmrproper $(mrproper-dirs)
1205 $(call cmd,rmdirs)
1206 $(call cmd,rmfiles)
1207
1208# distclean
1209#
Paul Smith4f193362006-03-05 17:14:10 -05001210PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
1212distclean: mrproper
1213 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001214 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001216 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 -type f -print | xargs rm -f
1218
1219
1220# Packaging of the kernel to various formats
1221# ---------------------------------------------------------------------------
1222# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001223package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001225%src-pkg: FORCE
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001227%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001228 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001229rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001230 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
1232
1233# Brief documentation of the typical targets used
1234# ---------------------------------------------------------------------------
1235
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001236boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001237boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001238board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1239board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
1241help:
1242 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001243 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001244 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001245 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001246 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 @echo ''
1248 @echo 'Configuration targets:'
1249 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1250 @echo ''
1251 @echo 'Other generic targets:'
1252 @echo ' all - Build all targets marked with [*]'
1253 @echo '* vmlinux - Build the bare kernel'
1254 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001255 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001256 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1257 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 @echo ' dir/ - Build all files in dir and below'
Joe Perches62718972010-01-13 09:31:44 -08001259 @echo ' dir/file.[oisS] - Build specified target only'
1260 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1261 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001262 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001263 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 @echo ' tags/TAGS - Generate tags file for editors'
1265 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001266 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001267 @echo ' kernelrelease - Output the release version string (use with make -s)'
1268 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1269 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001270 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001271 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001272 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 @echo ' checkstack - Generate a list of stack hogs'
1275 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001276 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001277 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001278 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001279 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001280 @echo ' headerdep - Detect inclusion cycles in headers'
1281 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1282 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001283 @echo 'Kernel selftest'
1284 @echo ' kselftest - Build and run kernel selftest (run as root)'
1285 @echo ' Build, install, and boot kernel before'
1286 @echo ' running kselftest on it'
1287 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001289 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 @echo ''
1291 @echo 'Documentation targets:'
1292 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1293 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001294 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001296 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 @echo ''
1298 @$(if $(boards), \
1299 $(foreach b, $(boards), \
1300 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1301 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001302 @$(if $(board-dirs), \
1303 $(foreach b, $(board-dirs), \
1304 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1305 printf " %-16s - Show all of the above\\n" help-boards; \
1306 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
1308 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001309 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001311 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1312 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001313 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001314 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1315 @echo ' 1: warnings which may be relevant and do not occur too often'
1316 @echo ' 2: warnings which occur quite often but may still be relevant'
1317 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001318 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 @echo ''
1320 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1321 @echo 'For further info see the ./README file'
1322
1323
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001324help-board-dirs := $(addprefix help-,$(board-dirs))
1325
1326help-boards: $(help-board-dirs)
1327
Michal Marekfbae4d52014-11-28 13:31:43 +01001328boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001329
1330$(help-board-dirs): help-%:
1331 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1332 @$(if $(boards-per-dir), \
1333 $(foreach b, $(boards-per-dir), \
1334 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1335 echo '')
1336
1337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338# Documentation targets
1339# ---------------------------------------------------------------------------
1340%docs: scripts_basic FORCE
Ben Hutchingsb479bfd2015-09-28 01:09:52 +01001341 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1343
1344else # KBUILD_EXTMOD
1345
1346###
1347# External module support.
1348# When building external modules the kernel used as basis is considered
1349# read-only, and no consistency checks are made and the make
1350# system is not used on the basis kernel. If updates are required
1351# in the basis kernel ordinary make commands (without M=...) must
1352# be used.
1353#
1354# The following are the only valid targets when building external
1355# modules.
1356# make M=dir clean Delete all automatically generated files
1357# make M=dir modules Make all modules in specified dir
1358# make M=dir Same as 'make M=dir modules'
1359# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001360# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361# Assumes install directory is already created
1362
1363# We are always building modules
1364KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001365PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001367 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
Paul Smith4f193362006-03-05 17:14:10 -05001369PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370$(objtree)/Module.symvers:
1371 @test -e $(objtree)/Module.symvers || ( \
1372 echo; \
1373 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1374 echo " is missing; modules will have no dependencies and modversions."; \
1375 echo )
1376
1377module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001378PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379$(module-dirs): crmodverdir $(objtree)/Module.symvers
1380 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1381
1382modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001383 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001384 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
Paul Smith4f193362006-03-05 17:14:10 -05001386PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001387modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001388
Paul Smith4f193362006-03-05 17:14:10 -05001389install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1390PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001391_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001392 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001393 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
Paul Smith4f193362006-03-05 17:14:10 -05001395PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001396_emodinst_post: _emodinst_
1397 $(call cmd,depmod)
1398
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1400
Paul Smith4f193362006-03-05 17:14:10 -05001401PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402$(clean-dirs):
1403 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1404
1405clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001406clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
1408help:
1409 @echo ' Building external modules.'
1410 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1411 @echo ''
1412 @echo ' modules - default target, build the module(s)'
1413 @echo ' modules_install - install the module'
1414 @echo ' clean - remove generated files in module directory only'
1415 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001416
1417# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001418PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001419prepare: ;
1420scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421endif # KBUILD_EXTMOD
1422
Michal Marek88d7be02010-09-06 12:00:08 +02001423clean: $(clean-dirs)
1424 $(call cmd,rmdirs)
1425 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001426 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001427 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001428 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001429 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001430 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001431 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1432 -o -name '*.symtypes' -o -name 'modules.order' \
1433 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1434 -o -name '*.gcno' \) -type f -print | xargs rm -f
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436# Generate tags for editors
1437# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001438quiet_cmd_tags = GEN $@
1439 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001441tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 $(call cmd,tags)
1443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444# Scripts to check various things for consistency
1445# ---------------------------------------------------------------------------
1446
Peter Foley279f3dd2011-04-26 17:15:01 -04001447PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001450 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001452 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
1454versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001455 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001457 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Nicolas Palix74425ee2010-06-06 17:15:01 +02001459coccicheck:
1460 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462namespacecheck:
1463 $(PERL) $(srctree)/scripts/namespace.pl
1464
Adrian Bunk295ac052007-08-24 23:04:56 +02001465export_report:
1466 $(PERL) $(srctree)/scripts/export_report.pl
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468endif #ifeq ($(config-targets),1)
1469endif #ifeq ($(mixed-targets),1)
1470
Mike Marciniszync398ff02013-06-24 08:48:37 -04001471PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001472
Jeff Dike011e3a92006-12-13 00:34:12 -08001473# UML needs a little special treatment here. It wants to use the host
1474# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1475# else wants $(ARCH), including people doing cross-builds, which means
1476# that $(SUBARCH) doesn't work here.
1477ifeq ($(ARCH), um)
1478CHECKSTACK_ARCH := $(SUBARCH)
1479else
1480CHECKSTACK_ARCH := $(ARCH)
1481endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482checkstack:
1483 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001484 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001486kernelrelease:
1487 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001488
Sam Ravnborgcb584552006-01-09 21:20:34 +01001489kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001490 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Mike Marciniszync398ff02013-06-24 08:48:37 -04001492image_name:
1493 @echo $(KBUILD_IMAGE)
1494
Borislav Petkovea01fa92012-04-11 18:36:18 +02001495# Clear a bunch of variables before executing the submake
1496tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001497 $(Q)mkdir -p $(objtree)/tools
Jiri Olsa16671c12015-04-18 22:34:39 +02001498 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001499
1500tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001501 $(Q)mkdir -p $(objtree)/tools
Jiri Olsa16671c12015-04-18 22:34:39 +02001502 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001503
Sam Ravnborg06300b22006-01-25 07:13:18 +01001504# Single targets
1505# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001506# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001507# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001508# - build with separate output dir 'make O=...'
1509# - external modules
1510#
1511# target-dir => where to store outputfile
1512# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001513
Sam Ravnborg06300b22006-01-25 07:13:18 +01001514ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001515 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001516 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001517else
1518 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001519 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1520 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001521endif
1522
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001523%.s: %.c prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.i: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527%.o: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529%.lst: %.c prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531%.s: %.S prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533%.o: %.S prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001535%.symtypes: %.c prepare scripts FORCE
1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001537
1538# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001539/: prepare scripts FORCE
1540 $(cmd_crmodverdir)
1541 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001543# Make sure the latest headers are built for Documentation
1544Documentation/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001545%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001546 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001547 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001548 $(build)=$(build-dir)
1549%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001550 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001551 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001552 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001553 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001554
Masahiro Yamada38385f82014-04-28 16:26:18 +09001555# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556# ===========================================================================
1557
1558quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1559 cmd_rmdirs = rm -rf $(rm-dirs)
1560
1561quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1562 cmd_rmfiles = rm -f $(rm-files)
1563
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001564# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001565quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001566 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301567 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001568
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001569# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001570# clean it up only when building all modules
1571cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574# read all saved command lines
1575
1576targets := $(wildcard $(sort $(targets)))
1577cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578
1579ifneq ($(cmd_files),)
1580 $(cmd_files): ; # Do not try to update included dependency files
1581 include $(cmd_files)
1582endif
1583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584endif # skip-makefile
1585
Paul Smith4f193362006-03-05 17:14:10 -05001586PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001588
Paul Smith4f193362006-03-05 17:14:10 -05001589# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001590# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001591.PHONY: $(PHONY)