blob: ee7ca5de970cb6cfadd4c04f5df4444ed07645a8 [file] [log] [blame]
Robert P. J. Day94f582f2007-10-16 23:26:11 -07001#ifndef __LINUX_COMPILER_H
2#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
3#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5/* These definitions are for GCC v4.x. */
6#include <linux/compiler-gcc.h>
7
Ingo Molnara9df3d02006-01-14 13:21:33 -08008#ifdef CONFIG_FORCED_INLINING
9# undef inline
10# undef __inline__
11# undef __inline
12# define inline inline __attribute__((always_inline))
13# define __inline__ __inline__ __attribute__((always_inline))
14# define __inline __inline __attribute__((always_inline))
15#endif
16
David Rientjes0d7ebbb2007-05-09 02:35:27 -070017#define __used __attribute__((__used__))
18#define __attribute_used__ __used /* deprecated */
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#define __must_check __attribute__((warn_unused_result))
20#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
Ingo Molnar40fc55c2006-01-14 13:21:28 -080021#define __always_inline inline __attribute__((always_inline))
Borislav Petkov94909912007-05-06 14:49:17 -070022
23/*
24 * A trick to suppress uninitialized variable warning without generating any
25 * code
26 */
27#define uninitialized_var(x) x = x
Andi Kleena586df02007-07-21 17:10:00 +020028
29#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
30/* Mark functions as cold. gcc will assume any path leading to a call
31 to them will be unlikely. This means a lot of manual unlikely()s
32 are unnecessary now for any paths leading to the usual suspects
33 like BUG(), printk(), panic() etc. [but let's keep them for now for
34 older compilers]
35
36 Early snapshots of gcc 4.3 don't support this and we can't detect this
37 in the preprocessor, but we can live with this because they're unreleased.
38 Maketime probing would be overkill here.
39
40 gcc also has a __attribute__((__hot__)) to move hot functions into
41 a special section, but I don't see any sense in this right now in
42 the kernel context */
43#define __cold __attribute__((__cold__))
44
45#endif