[tip:perf/urgent] perf arm spe: Fix uninitialized record error variable

[tip-bot for Kim Phillips <tipbot@zytor.com>]

Commit-ID:  344353366591acf659a0d0dea498611da78d67e2
Gitweb:     https://git.kernel.org/tip/344353366591acf659a0d0dea498611da78d67e2
Author:     Kim Phillips <kim.phillips@arm.com>
AuthorDate: Fri, 10 Aug 2018 17:45:12 -0500
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 14 Aug 2018 15:10:44 -0300

perf arm spe: Fix uninitialized record error variable

The auxtrace init variable 'err' was not being initialized, leading perf
to abort early in an SPE record command when there was no explicit
error, rather only based whatever memory contents were on the stack.
Initialize it explicitly on getting an SPE successfully, the same way
cs-etm does.

Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Dongjiu Geng <gengdongjiu@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: ffd3d18c20b8 ("perf tools: Add ARM Statistical Profiling Extensions (SPE) support")
Link: http://lkml.kernel.org/r/20180810174512.52900813e57cbccf18ce99a2@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/arch/arm64/util/arm-spe.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
index 1120e39c1b00..5ccfce87e693 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -194,6 +194,7 @@ struct auxtrace_record *arm_spe_recording_init(int *err,
 	sper->itr.read_finish = arm_spe_read_finish;
 	sper->itr.alignment = 0;
 
+	*err = 0;
 	return &sper->itr;
 }