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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-02-13 20:11:44 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-02-13 23:22:32 +0300
commit14e4d7e0abfdefabea2b8796c5a8b2b9c77b5326 (patch)
tree67534e032e643bc2a42d82e7f7645ce8d1bac8a8 /tools/lib/traceevent
parentd7dd112ea5cacf91ae72c0714c3b911eb6016fea (diff)
downloadlinux-14e4d7e0abfdefabea2b8796c5a8b2b9c77b5326.tar.xz
tools lib traceevent: Initialize lenght on OLD_RING_BUFFER_TYPE_TIME_STAMP
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>
Diffstat (limited to 'tools/lib/traceevent')
-rw-r--r--tools/lib/traceevent/kbuffer-parse.c1
1 files changed, 1 insertions, 0 deletions
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: