blob: 03ec2311fb29c9ce4d252e2e9b41b8eea19e8e18 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Never include this file directly. Include <linux/compiler.h> instead. */
2
3/*
4 * Common definitions for all gcc versions go here.
5 */
6
7
8/* Optimization barrier */
9/* The "volatile" is due to gcc bugs */
10#define barrier() __asm__ __volatile__("": : :"memory")
11
12/* This macro obfuscates arithmetic on a variable address so that gcc
13 shouldn't recognize the original var, and make assumptions about it */
Anton Blanchardc8d52462006-01-10 18:21:20 +110014/*
15 * Versions of the ppc64 compiler before 4.1 had a bug where use of
16 * RELOC_HIDE could trash r30. The bug can be worked around by changing
17 * the inline assembly constraint from =g to =r, in this particular
18 * case either is valid.
19 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#define RELOC_HIDE(ptr, off) \
21 ({ unsigned long __ptr; \
Anton Blanchardc8d52462006-01-10 18:21:20 +110022 __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 (typeof(ptr)) (__ptr + (off)); })
Andrew Mortona1365642006-01-08 01:04:09 -080024
Rusty Russellc5e631cf2007-05-06 14:51:05 -070025/* &a[0] degrades to a pointer: a different type from an array */
26#define __must_be_array(a) \
27 BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
Andrew Mortona1365642006-01-08 01:04:09 -080028
29#define inline inline __attribute__((always_inline))
30#define __inline__ __inline__ __attribute__((always_inline))
31#define __inline __inline __attribute__((always_inline))
32#define __deprecated __attribute__((deprecated))
Robert P. J. Day82ddcb02007-02-10 01:46:20 -080033#define __packed __attribute__((packed))
34#define __weak __attribute__((weak))
35#define __naked __attribute__((naked))
36#define __noreturn __attribute__((noreturn))
37#define __pure __attribute__((pure))
38#define __aligned(x) __attribute__((aligned(x)))
39#define __printf(a,b) __attribute__((format(printf,a,b)))
Andrew Mortona1365642006-01-08 01:04:09 -080040#define noinline __attribute__((noinline))
41#define __attribute_pure__ __attribute__((pure))
42#define __attribute_const__ __attribute__((__const__))
David Rientjes0d7ebbb2007-05-09 02:35:27 -070043#define __maybe_unused __attribute__((unused))