| From 96b4fb75d15be65edc5494579e4a944534042f99 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sasha.levin@oracle.com> |
| Date: Mon, 13 Oct 2014 15:51:05 -0700 |
| Subject: [PATCH] kernel: add support for gcc 5 |
| |
| We're missing include/linux/compiler-gcc5.h which is required now |
| because gcc branched off to v5 in trunk. |
| |
| Just copy the relevant bits out of include/linux/compiler-gcc4.h, |
| no new code is added as of now. |
| |
| This fixes a build error when using gcc 5. |
| |
| Signed-off-by: Sasha Levin <sasha.levin@oracle.com> |
| Cc: <stable@vger.kernel.org> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
| (cherry picked from commit 71458cfc782eafe4b27656e078d379a34e472adf) |
| Signed-off-by: Peter Korsgaard <peter@korsgaard.com> |
| --- |
| include/linux/compiler-gcc5.h | 66 +++++++++++++++++++++++++++++++++++++++++++ |
| 1 file changed, 66 insertions(+) |
| create mode 100644 include/linux/compiler-gcc5.h |
| |
| diff --git a/include/linux/compiler-gcc5.h b/include/linux/compiler-gcc5.h |
| new file mode 100644 |
| index 0000000..cdd1cc2 |
| --- /dev/null |
| +++ b/include/linux/compiler-gcc5.h |
| @@ -0,0 +1,66 @@ |
| +#ifndef __LINUX_COMPILER_H |
| +#error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." |
| +#endif |
| + |
| +#define __used __attribute__((__used__)) |
| +#define __must_check __attribute__((warn_unused_result)) |
| +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) |
| + |
| +/* Mark functions as cold. gcc will assume any path leading to a call |
| + to them will be unlikely. This means a lot of manual unlikely()s |
| + are unnecessary now for any paths leading to the usual suspects |
| + like BUG(), printk(), panic() etc. [but let's keep them for now for |
| + older compilers] |
| + |
| + Early snapshots of gcc 4.3 don't support this and we can't detect this |
| + in the preprocessor, but we can live with this because they're unreleased. |
| + Maketime probing would be overkill here. |
| + |
| + gcc also has a __attribute__((__hot__)) to move hot functions into |
| + a special section, but I don't see any sense in this right now in |
| + the kernel context */ |
| +#define __cold __attribute__((__cold__)) |
| + |
| +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
| + |
| +#ifndef __CHECKER__ |
| +# define __compiletime_warning(message) __attribute__((warning(message))) |
| +# define __compiletime_error(message) __attribute__((error(message))) |
| +#endif /* __CHECKER__ */ |
| + |
| +/* |
| + * Mark a position in code as unreachable. This can be used to |
| + * suppress control flow warnings after asm blocks that transfer |
| + * control elsewhere. |
| + * |
| + * Early snapshots of gcc 4.5 don't support this and we can't detect |
| + * this in the preprocessor, but we can live with this because they're |
| + * unreleased. Really, we need to have autoconf for the kernel. |
| + */ |
| +#define unreachable() __builtin_unreachable() |
| + |
| +/* Mark a function definition as prohibited from being cloned. */ |
| +#define __noclone __attribute__((__noclone__)) |
| + |
| +/* |
| + * Tell the optimizer that something else uses this function or variable. |
| + */ |
| +#define __visible __attribute__((externally_visible)) |
| + |
| +/* |
| + * GCC 'asm goto' miscompiles certain code sequences: |
| + * |
| + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 |
| + * |
| + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. |
| + * Fixed in GCC 4.8.2 and later versions. |
| + * |
| + * (asm goto is automatically volatile - the naming reflects this.) |
| + */ |
| +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) |
| + |
| +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
| +#define __HAVE_BUILTIN_BSWAP32__ |
| +#define __HAVE_BUILTIN_BSWAP64__ |
| +#define __HAVE_BUILTIN_BSWAP16__ |
| +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |
| -- |
| 2.10.2 |
| |