68f4cc2f86
[ Upstream commit b5bf1733d6a391c4e90ea8f8468d83023be74a2a ]
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>
49 lines
897 B
C
49 lines
897 B
C
#ifndef _TOOLS_LINUX_COMPILER_H_
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#define _TOOLS_LINUX_COMPILER_H_
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#ifndef __always_inline
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# define __always_inline inline __attribute__((always_inline))
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#endif
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#define __user
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#ifndef __attribute_const__
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# define __attribute_const__
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#endif
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#ifndef __maybe_unused
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# define __maybe_unused __attribute__((unused))
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#endif
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#ifndef __packed
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# define __packed __attribute__((__packed__))
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#endif
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#ifndef __force
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# define __force
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#endif
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#ifndef __weak
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# define __weak __attribute__((weak))
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#endif
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#ifndef likely
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# define likely(x) __builtin_expect(!!(x), 1)
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#endif
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#ifndef unlikely
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# define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
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#ifndef __fallthrough
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# if defined(__GNUC__) && __GNUC__ >= 7
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# define __fallthrough __attribute__ ((fallthrough))
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# else
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# define __fallthrough
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# endif
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#endif
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#endif /* _TOOLS_LINUX_COMPILER_H */
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