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71458cfc SL |
1 | #ifndef __LINUX_COMPILER_H |
2 | #error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." | |
3 | #endif | |
4 | ||
5 | #define __used __attribute__((__used__)) | |
6 | #define __must_check __attribute__((warn_unused_result)) | |
7 | #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) | |
8 | ||
9 | /* Mark functions as cold. gcc will assume any path leading to a call | |
10 | to them will be unlikely. This means a lot of manual unlikely()s | |
11 | are unnecessary now for any paths leading to the usual suspects | |
12 | like BUG(), printk(), panic() etc. [but let's keep them for now for | |
13 | older compilers] | |
14 | ||
15 | Early snapshots of gcc 4.3 don't support this and we can't detect this | |
16 | in the preprocessor, but we can live with this because they're unreleased. | |
17 | Maketime probing would be overkill here. | |
18 | ||
19 | gcc also has a __attribute__((__hot__)) to move hot functions into | |
20 | a special section, but I don't see any sense in this right now in | |
21 | the kernel context */ | |
22 | #define __cold __attribute__((__cold__)) | |
23 | ||
24 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) | |
25 | ||
26 | #ifndef __CHECKER__ | |
27 | # define __compiletime_warning(message) __attribute__((warning(message))) | |
28 | # define __compiletime_error(message) __attribute__((error(message))) | |
29 | #endif /* __CHECKER__ */ | |
30 | ||
31 | /* | |
32 | * Mark a position in code as unreachable. This can be used to | |
33 | * suppress control flow warnings after asm blocks that transfer | |
34 | * control elsewhere. | |
35 | * | |
36 | * Early snapshots of gcc 4.5 don't support this and we can't detect | |
37 | * this in the preprocessor, but we can live with this because they're | |
38 | * unreleased. Really, we need to have autoconf for the kernel. | |
39 | */ | |
40 | #define unreachable() __builtin_unreachable() | |
41 | ||
42 | /* Mark a function definition as prohibited from being cloned. */ | |
43 | #define __noclone __attribute__((__noclone__)) | |
44 | ||
45 | /* | |
46 | * Tell the optimizer that something else uses this function or variable. | |
47 | */ | |
48 | #define __visible __attribute__((externally_visible)) | |
49 | ||
50 | /* | |
51 | * GCC 'asm goto' miscompiles certain code sequences: | |
52 | * | |
53 | * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 | |
54 | * | |
55 | * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. | |
56 | * Fixed in GCC 4.8.2 and later versions. | |
57 | * | |
58 | * (asm goto is automatically volatile - the naming reflects this.) | |
59 | */ | |
60 | #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) | |
61 | ||
62 | #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP | |
63 | #define __HAVE_BUILTIN_BSWAP32__ | |
64 | #define __HAVE_BUILTIN_BSWAP64__ | |
65 | #define __HAVE_BUILTIN_BSWAP16__ | |
66 | #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |