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- From 5b07fc2c680ad4279a45d863108544020b4d74cd 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 2/6] 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>
- ---
- 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 */
- --
- 2.4.4
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