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1da177e4 LT |
1 | /* Never include this file directly. Include <linux/compiler.h> instead. */ |
2 | ||
3 | /* These definitions are for GCC v4.x. */ | |
4 | #include <linux/compiler-gcc.h> | |
5 | ||
a9df3d0f IM |
6 | #ifdef CONFIG_FORCED_INLINING |
7 | # undef inline | |
8 | # undef __inline__ | |
9 | # undef __inline | |
10 | # define inline inline __attribute__((always_inline)) | |
11 | # define __inline__ __inline__ __attribute__((always_inline)) | |
12 | # define __inline __inline __attribute__((always_inline)) | |
13 | #endif | |
14 | ||
0d7ebbbc DR |
15 | #define __used __attribute__((__used__)) |
16 | #define __attribute_used__ __used /* deprecated */ | |
1da177e4 LT |
17 | #define __must_check __attribute__((warn_unused_result)) |
18 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) | |
40fc55cb | 19 | #define __always_inline inline __attribute__((always_inline)) |
94909914 BP |
20 | |
21 | /* | |
22 | * A trick to suppress uninitialized variable warning without generating any | |
23 | * code | |
24 | */ | |
25 | #define uninitialized_var(x) x = x | |
a586df06 AK |
26 | |
27 | #if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3) | |
28 | /* Mark functions as cold. gcc will assume any path leading to a call | |
29 | to them will be unlikely. This means a lot of manual unlikely()s | |
30 | are unnecessary now for any paths leading to the usual suspects | |
31 | like BUG(), printk(), panic() etc. [but let's keep them for now for | |
32 | older compilers] | |
33 | ||
34 | Early snapshots of gcc 4.3 don't support this and we can't detect this | |
35 | in the preprocessor, but we can live with this because they're unreleased. | |
36 | Maketime probing would be overkill here. | |
37 | ||
38 | gcc also has a __attribute__((__hot__)) to move hot functions into | |
39 | a special section, but I don't see any sense in this right now in | |
40 | the kernel context */ | |
41 | #define __cold __attribute__((__cold__)) | |
42 | ||
43 | #endif |