Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 24/32] tools include: Add a __fallthrough statement | Date | Thu, 9 Feb 2017 22:39:32 -0300 |
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From: Arnaldo Carvalho de Melo <acme@redhat.com>
For cases where implicit fall through case labels are intended, to let us inform that to gcc >= 7:
CC /tmp/build/perf/util/string.o util/string.c: In function 'perf_atoll': util/string.c:22:7: error: this statement may fall through [-Werror=implicit-fallthrough=] if (*p) ^ util/string.c:24:3: note: here case '\0': ^~~~
So we introduce:
#define __fallthrough __attribute__ ((fallthrough))
And use it in such cases.
Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: William Cohen <wcohen@redhat.com> Link: http://lkml.kernel.org/n/tip-qnpig0xfop4hwv6k4mv1wts5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/include/linux/compiler.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index e33fc1df3935..d94179f94caa 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -126,4 +126,13 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s #define WRITE_ONCE(x, val) \ ({ union { typeof(x) __val; char __c[1]; } __u = { .__val = (val) }; __write_once_size(&(x), __u.__c, sizeof(x)); __u.__val; }) + +#ifndef __fallthrough +# if defined(__GNUC__) && __GNUC__ >= 7 +# define __fallthrough __attribute__ ((fallthrough)) +# else +# define __fallthrough +# endif +#endif + #endif /* _TOOLS_LINUX_COMPILER_H */ -- 2.9.3
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