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perf diff: Add missing hists__init() call at tool start

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It also uses hists/hist_entries, hists__init() should be called before
creating any evsels.

Otherwise no extra space will be allocated per perf_evsel nor this space
will be initialized when allocating a new perf_evsel instance, resulting
in reads/writes to non allocated space, oops. Fix it.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Link: http://lkml.kernel.org/r/1414004561-22096-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2014-10-22 15:02:41 -04:00 committed by Arnaldo Carvalho de Melo
parent 3b10ea7f92
commit 9ab1f50876
1 changed files with 5 additions and 0 deletions
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5
tools/perf/builtin-diff.c
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@ -1142,6 +1142,11 @@ static int data_init(int argc, const char **argv)
int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
{
int ret = hists__init();
if (ret < 0)
return ret;
perf_config(perf_default_config, NULL);
argc = parse_options(argc, argv, options, diff_usage, 0);