Robert P. J. Day | 94f582f | 2007-10-16 23:26:11 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_COMPILER_H |
| 2 | #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead." |
| 3 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
David Rientjes | 0d7ebbb | 2007-05-09 02:35:27 -0700 | [diff] [blame] | 5 | #define __used __attribute__((__used__)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #define __must_check __attribute__((warn_unused_result)) |
| 7 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) |
Ingo Molnar | 40fc55c | 2006-01-14 13:21:28 -0800 | [diff] [blame] | 8 | #define __always_inline inline __attribute__((always_inline)) |
Borislav Petkov | 9490991 | 2007-05-06 14:49:17 -0700 | [diff] [blame] | 9 | |
| 10 | /* |
| 11 | * A trick to suppress uninitialized variable warning without generating any |
| 12 | * code |
| 13 | */ |
| 14 | #define uninitialized_var(x) x = x |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 15 | |
Linus Torvalds | f153b82 | 2009-01-02 09:23:03 -0800 | [diff] [blame^] | 16 | #if __GNUC_MINOR__ >= 3 |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 17 | /* Mark functions as cold. gcc will assume any path leading to a call |
| 18 | to them will be unlikely. This means a lot of manual unlikely()s |
| 19 | are unnecessary now for any paths leading to the usual suspects |
| 20 | like BUG(), printk(), panic() etc. [but let's keep them for now for |
| 21 | older compilers] |
| 22 | |
| 23 | Early snapshots of gcc 4.3 don't support this and we can't detect this |
| 24 | in the preprocessor, but we can live with this because they're unreleased. |
| 25 | Maketime probing would be overkill here. |
| 26 | |
| 27 | gcc also has a __attribute__((__hot__)) to move hot functions into |
| 28 | a special section, but I don't see any sense in this right now in |
| 29 | the kernel context */ |
| 30 | #define __cold __attribute__((__cold__)) |
| 31 | |
| 32 | #endif |