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[PATCH 07/15] tools lib traceevent: Initialize lenght on OLD_RING_BUFFER_TYPE_TIME_STAMP

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From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

A undefined value was being used for the OLD_RING_BUFFER_TYPE_TIME_STAMP
case entry, as the 'length' variable was not being initialized, fix it.

Caught by the reporter when building tools/perf/ using clang, which emmitted
this warning:

  kbuffer-parse.c:312:7: warning: variable 'length' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized]
          case OLD_RINGBUF_TYPE_TIME_EXTEND:
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
  kbuffer-parse.c:339:29: note: uninitialized use occurs here
          kbuf->next = kbuf->index + length;
                                   ^~~~~~
  kbuffer-parse.c:297:21: note: initialize the variable 'length' to silence this warning
          unsigned int length;
                             ^
                              = 0

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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>
Link: http://lkml.kernel.org/r/20170213121418.47f279e8@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/kbuffer-parse.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/traceevent/kbuffer-parse.c b/tools/lib/traceevent/kbuffer-parse.c
index 65984f1c2974..c94e3641b046 100644
--- a/tools/lib/traceevent/kbuffer-parse.c
+++ b/tools/lib/traceevent/kbuffer-parse.c
@@ -315,6 +315,7 @@ static unsigned int old_update_pointers(struct kbuffer *kbuf)
 		extend += delta;
 		delta = extend;
 		ptr += 4;
+		length = 0;
 		break;
 
 	case OLD_RINGBUF_TYPE_TIME_STAMP:
-- 
2.9.3

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[GIT PULL 00/15] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 04/15] perf diff: Add diff.compute config option Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 11/15] perf tests record: No need to test an array against NULL Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 08/15] tools lib traceevent plugin function: Initialize 'index' variable Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 14/15] samples/bpf: Ignore already processed ELF sections Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 01/15] tools include: Introduce linux/compiler-gcc.h Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 07/15] tools lib traceevent: Initialize lenght on OLD_RING_BUFFER_TYPE_TIME_STAMP Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  [PATCH 09/15] perf evsel: Inform how to make a sysctl setting permanent Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-14 02:20 +0100
  Re: [GIT PULL 00/15] perf/core improvements and fixes Ingo Molnar <mingo@kernel.org> - 2017-02-14 07:40 +0100

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