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- From 478b02f1a7043b673565075ea5016376f3293b23 Mon Sep 17 00:00:00 2001
- From: Hans de Goede <[email protected]>
- Date: Sat, 7 Feb 2015 22:52:40 +0100
- Subject: 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 <[email protected]>
- Date: Sat Oct 25 15:09:42 2014 -0700
- compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles
- Signed-off-by: Hans de Goede <[email protected]>
- ---
- include/linux/compiler-gcc5.h | 65 +++++++++++++++++++++++++++++++++++++++++++
- 1 file changed, 65 insertions(+)
- create mode 100644 include/linux/compiler-gcc5.h
- --- /dev/null
- +++ b/include/linux/compiler-gcc5.h
- @@ -0,0 +1,65 @@
- +#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.
- + *
- + * (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 */
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