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 LT |
4 | |
5 | /* These definitions are for GCC v4.x. */ | |
6 | #include <linux/compiler-gcc.h> | |
7 | ||
a9df3d0f IM |
8 | #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 | ||
0d7ebbbc DR |
17 | #define __used __attribute__((__used__)) |
18 | #define __attribute_used__ __used /* deprecated */ | |
1da177e4 LT |
19 | #define __must_check __attribute__((warn_unused_result)) |
20 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) | |
40fc55cb | 21 | #define __always_inline inline __attribute__((always_inline)) |
94909914 BP |
22 | |
23 | /* | |
24 | * A trick to suppress uninitialized variable warning without generating any | |
25 | * code | |
26 | */ | |
27 | #define uninitialized_var(x) x = x | |
a586df06 AK |
28 | |
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 |