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    • Irina Tirdea's avatar
      perf tools: Use __maybe_used for unused variables · 1d037ca1
      Irina Tirdea authored
      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: default avatarIrina Tirdea <irina.tirdea@intel.com>
      Acked-by: default avatarPekka 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 a116e05d in builtin-sched.c ]
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      1d037ca1
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