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| author | Irina Tirdea <irina.tirdea@gmail.com> | 2012-09-11 01:15:03 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-09-11 12:19:15 -0300 |
| commit | 1d037ca1648b775277fc96401ec2aa233724906c (patch) | |
| tree | 266722dc6c9e00c67c66f5f8d06f30d0c2dd3979 /tools/perf/util/include | |
| parent | 7dbf4dcfe2987c35c2c4675cd7ae1b6006979176 (diff) | |
| download | talos-obmc-linux-1d037ca1648b775277fc96401ec2aa233724906c.tar.gz talos-obmc-linux-1d037ca1648b775277fc96401ec2aa233724906c.zip | |
perf tools: Use __maybe_used for unused variables
perf defines both __used and __unused variables to use for marking
unused variables. The variable __used is defined to
__attribute__((__unused__)), which contradicts the kernel definition to
__attribute__((__used__)) for new gcc versions. On Android, __used is
also defined in system headers and this leads to warnings like: warning:
'__used__' attribute ignored
__unused is not defined in the kernel and is not a standard definition.
If __unused is included everywhere instead of __used, this leads to
conflicts with glibc headers, since glibc has a variables with this name
in its headers.
The best approach is to use __maybe_unused, the definition used in the
kernel for __attribute__((unused)). In this way there is only one
definition in perf sources (instead of 2 definitions that point to the
same thing: __used and __unused) and it works on both Linux and Android.
This patch simply replaces all instances of __used and __unused with
__maybe_unused.
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347315303-29906-7-git-send-email-irina.tirdea@intel.com
[ committer note: fixed up conflict with a116e05 in builtin-sched.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/include')
| -rw-r--r-- | tools/perf/util/include/linux/compiler.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/util/include/linux/compiler.h b/tools/perf/util/include/linux/compiler.h index ce2367b7b3f6..96b919dae11c 100644 --- a/tools/perf/util/include/linux/compiler.h +++ b/tools/perf/util/include/linux/compiler.h @@ -9,7 +9,9 @@ #define __attribute_const__ #endif -#define __used __attribute__((__unused__)) +#ifndef __maybe_unused +#define __maybe_unused __attribute__((unused)) +#endif #define __packed __attribute__((__packed__)) #ifndef __force |
