Commit | Line | Data |
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94f582f8 RD |
1 | #ifndef __LINUX_COMPILER_H |
2 | #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead." | |
3 | #endif | |
1da177e4 | 4 | |
f9d14250 LT |
5 | /* GCC 4.1.[01] miscompiles __weak */ |
6 | #if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1 | |
7 | # error Your version of gcc miscompiles the __weak directive | |
8 | #endif | |
9 | ||
0d7ebbbc | 10 | #define __used __attribute__((__used__)) |
1da177e4 LT |
11 | #define __must_check __attribute__((warn_unused_result)) |
12 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) | |
40fc55cb | 13 | #define __always_inline inline __attribute__((always_inline)) |
94909914 BP |
14 | |
15 | /* | |
16 | * A trick to suppress uninitialized variable warning without generating any | |
17 | * code | |
18 | */ | |
19 | #define uninitialized_var(x) x = x | |
a586df06 | 20 | |
f153b821 | 21 | #if __GNUC_MINOR__ >= 3 |
a586df06 AK |
22 | /* Mark functions as cold. gcc will assume any path leading to a call |
23 | to them will be unlikely. This means a lot of manual unlikely()s | |
24 | are unnecessary now for any paths leading to the usual suspects | |
25 | like BUG(), printk(), panic() etc. [but let's keep them for now for | |
26 | older compilers] | |
27 | ||
28 | Early snapshots of gcc 4.3 don't support this and we can't detect this | |
29 | in the preprocessor, but we can live with this because they're unreleased. | |
30 | Maketime probing would be overkill here. | |
31 | ||
32 | gcc also has a __attribute__((__hot__)) to move hot functions into | |
33 | a special section, but I don't see any sense in this right now in | |
34 | the kernel context */ | |
35 | #define __cold __attribute__((__cold__)) | |
36 | ||
37 | #endif |