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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 | 5 | /* GCC 4.1.[01] miscompiles __weak */ |
8cd2c29d PA |
6 | #ifdef __KERNEL__ |
7 | # if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1 | |
8 | # error Your version of gcc miscompiles the __weak directive | |
9 | # endif | |
f9d14250 LT |
10 | #endif |
11 | ||
0d7ebbbc | 12 | #define __used __attribute__((__used__)) |
1da177e4 LT |
13 | #define __must_check __attribute__((warn_unused_result)) |
14 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) | |
a586df06 | 15 | |
6640dfdf DS |
16 | #if __GNUC_MINOR__ > 0 |
17 | # define __compiletime_object_size(obj) __builtin_object_size(obj, 0) | |
18 | #endif | |
19 | ||
f153b821 | 20 | #if __GNUC_MINOR__ >= 3 |
a586df06 AK |
21 | /* Mark functions as cold. gcc will assume any path leading to a call |
22 | to them will be unlikely. This means a lot of manual unlikely()s | |
23 | are unnecessary now for any paths leading to the usual suspects | |
24 | like BUG(), printk(), panic() etc. [but let's keep them for now for | |
25 | older compilers] | |
26 | ||
27 | Early snapshots of gcc 4.3 don't support this and we can't detect this | |
28 | in the preprocessor, but we can live with this because they're unreleased. | |
29 | Maketime probing would be overkill here. | |
30 | ||
31 | gcc also has a __attribute__((__hot__)) to move hot functions into | |
32 | a special section, but I don't see any sense in this right now in | |
33 | the kernel context */ | |
34 | #define __cold __attribute__((__cold__)) | |
35 | ||
1399ff86 | 36 | #define __linktime_error(message) __attribute__((__error__(message))) |
38938c87 | 37 | |
6f33d587 RR |
38 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
39 | ||
6640dfdf DS |
40 | #ifndef __CHECKER__ |
41 | # define __compiletime_warning(message) __attribute__((warning(message))) | |
42 | # define __compiletime_error(message) __attribute__((error(message))) | |
43 | #endif /* __CHECKER__ */ | |
44 | #endif /* __GNUC_MINOR__ >= 3 */ | |
45 | ||
38938c87 DD |
46 | #if __GNUC_MINOR__ >= 5 |
47 | /* | |
48 | * Mark a position in code as unreachable. This can be used to | |
49 | * suppress control flow warnings after asm blocks that transfer | |
50 | * control elsewhere. | |
51 | * | |
52 | * Early snapshots of gcc 4.5 don't support this and we can't detect | |
53 | * this in the preprocessor, but we can live with this because they're | |
54 | * unreleased. Really, we need to have autoconf for the kernel. | |
55 | */ | |
56 | #define unreachable() __builtin_unreachable() | |
9c695203 MP |
57 | |
58 | /* Mark a function definition as prohibited from being cloned. */ | |
59 | #define __noclone __attribute__((__noclone__)) | |
60 | ||
6640dfdf | 61 | #endif /* __GNUC_MINOR__ >= 5 */ |
9f0cf4ad | 62 | |
9a858dc7 AK |
63 | #if __GNUC_MINOR__ >= 6 |
64 | /* | |
65 | * Tell the optimizer that something else uses this function or variable. | |
66 | */ | |
67 | #define __visible __attribute__((externally_visible)) | |
68 | #endif | |
69 | ||
cf66bb93 DW |
70 | |
71 | #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP | |
72 | #if __GNUC_MINOR__ >= 4 | |
73 | #define __HAVE_BUILTIN_BSWAP32__ | |
74 | #define __HAVE_BUILTIN_BSWAP64__ | |
75 | #endif | |
76 | #if __GNUC_MINOR__ >= 8 || (defined(__powerpc__) && __GNUC_MINOR__ >= 6) | |
77 | #define __HAVE_BUILTIN_BSWAP16__ | |
78 | #endif | |
79 | #endif |