This adds support for gcc 5. In kernel version >= 3.18 this is shipped with the kernel, in kernel version >= 4.2 all the gcc version specific files are merged into one file. This patch got backported to many kernel versions, but ignore it because it is always the same file. Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx> --- backport/backport-include/linux/compiler-gcc5.h | 73 +++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 backport/backport-include/linux/compiler-gcc5.h diff --git a/backport/backport-include/linux/compiler-gcc5.h b/backport/backport-include/linux/compiler-gcc5.h new file mode 100644 index 0000000..4e2f7c4 --- /dev/null +++ b/backport/backport-include/linux/compiler-gcc5.h @@ -0,0 +1,73 @@ +#ifndef __LINUX_COMPILER_H +#error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." +#endif + +#include <linux/version.h> + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0) +#include_next <linux/compiler-gcc5.h> +#else + +#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 */ +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */ -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe backports" in
