From: Arnaldo Carvalho de Melo <a...@redhat.com>
commit b5bf1733d6a391c4e90ea8f8468d83023be74a2a upstream.
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.hun...@intel.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Wang Nan <wangn...@huawei.com>
Cc: William Cohen <wco...@redhat.com>
Link: http://lkml.kernel.org/n/tip-qnpig0xfop4hwv6k4mv1w...@git.kernel.org
Fixes: ed8306908374 ("perf top: Use __fallthrough")
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
tools/include/linux/compiler.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 88461f09cc86..8717c80f759c 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -37,4 +37,12 @@
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+#ifndef __fallthrough
+# if defined(__GNUC__) && __GNUC__ >= 7
+# define __fallthrough __attribute__ ((fallthrough))
+# else
+# define __fallthrough
+# endif
+#endif
+
#endif /* _TOOLS_LINUX_COMPILER_H */
--
2.14.1
