commit 25165120f2432ffa36518d53bd3ec66f6e434f63
author Ingo Molnar <mingo@elte.hu> Thu Feb 22 09:38:22 2007 +0100
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Mon Feb 26 12:53:30 2007 -0800
tree 7ef036d734cb14579040d2825bdf30a9a24daca5
parent 38bed5429987c939d86cd3da915d6706fd1e6e53

[PATCH] x86: add -freg-struct-return to CFLAGS

Jeremy Fitzhardinge suggested the use of -freg-struct-return, which does
structure-returns (such as when using pte_t) in registers instead of on
the stack.

that is indeed so, and this option reduced the kernel size a bit:

    text    data     bss     dec     hex filename
 4799506  543456 3760128 9103090  8ae6f2 vmlinux.before
 4798117  543456 3760128 9101701  8ae185 vmlinux.after

the resulting kernel booted fine on my testbox. Lets go for it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/i386/Makefile

diff --git a/arch/i386/Makefile b/arch/i386/Makefile
index f7ac1ae..bd28f9f 100644
--- a/arch/i386/Makefile
+++ b/arch/i386/Makefile
@@ -31,7 +31,7 @@
 endif
 CHECKFLAGS	+= -D__i386__
 
-CFLAGS += -pipe -msoft-float -mregparm=3
+CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return
 
 # prevent gcc from keeping the stack 16 byte aligned
 CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)