Commit 478b02f1a7043b673565075ea5016376f3293b23
Committed by
Tom Rini
Tom Rini
1 parent
db7a7dee68
Exists in
v2017.01-smarct4x
and in
37 other branches
Add linux/compiler-gcc5.h to fix builds with gcc5
Add linux/compiler-gcc5/h from the kernel sources at:
commit 5631b8fba640a4ab2f8a954f63a603fa34eda96b
Author: Steven Noonan <steven@uplinklabs.net>
Date: Sat Oct 25 15:09:42 2014 -0700
compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Showing 1 changed file with 65 additions and 0 deletions Side-by-side Diff
include/linux/compiler-gcc5.h
| 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 | + * | |
| 57 | + * (asm goto is automatically volatile - the naming reflects this.) | |
| 58 | + */ | |
| 59 | +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) | |
| 60 | + | |
| 61 | +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP | |
| 62 | +#define __HAVE_BUILTIN_BSWAP32__ | |
| 63 | +#define __HAVE_BUILTIN_BSWAP64__ | |
| 64 | +#define __HAVE_BUILTIN_BSWAP16__ | |
| 65 | +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |