This is a note to let you know that I've just added the patch titled
tools include: Add a __fallthrough statement
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tools-include-add-a-__fallthrough-statement.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5bf1733d6a391c4e90ea8f8468d83023be74a2a Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Date: Wed, 8 Feb 2017 17:01:46 -0300
Subject: tools include: Add a __fallthrough statement
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: William Cohen <wcohen@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-qnpig0xfop4hwv6k4mv1wts5@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/include/linux/compiler.h | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -126,4 +126,13 @@ static __always_inline void __write_once
#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 */
Patches currently in stable-queue which might be from acme@xxxxxxxxxx are
queue-4.9/perf-thread_map-correctly-size-buffer-used-with-dirent-dt_name.patch
queue-4.9/perf-tests-avoid-possible-truncation-with-dirent-d_name-snprintf.patch
queue-4.9/perf-top-use-__fallthrough.patch
queue-4.9/perf-scripting-perl-fix-compile-error-with-some-perl5-versions.patch
queue-4.9/perf-bench-numa-avoid-possible-truncation-when-using-snprintf.patch
queue-4.9/perf-probe-add-error-checks-to-offline-probe-post-processing.patch
queue-4.9/perf-header-fix-handling-of-perf_event_update__scale.patch
queue-4.9/tools-string-use-__fallthrough-in-perf_atoll.patch
queue-4.9/perf-intel-pt-use-__fallthrough.patch
queue-4.9/tools-include-add-a-__fallthrough-statement.patch
queue-4.9/tools-strfilter-use-__fallthrough.patch
queue-4.9/perf-probe-fix-to-probe-on-gcc-generated-symbols-for-offline-kernel.patch