linux-kernel - [tip:perf/core] perf cs-etm: Fix wrong return values in error path

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Date:   Fri, 15 Feb 2019 01:40:43 -0800
From:   tip-bot for Mathieu Poirier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mathieu.poirier@...aro.org, leo.yan@...aro.org,
        linux-kernel@...r.kernel.org, hpa@...or.com, acme@...hat.com,
        jolsa@...hat.com, tglx@...utronix.de, peterz@...radead.org,
        mingo@...nel.org, suzuki.poulose@....com
Subject: [tip:perf/core] perf cs-etm: Fix wrong return values in error path

Commit-ID:  d3267ad43dd8b3778f9b3deb9a3946c844bdc9dc
Gitweb:     https://git.kernel.org/tip/d3267ad43dd8b3778f9b3deb9a3946c844bdc9dc
Author:     Mathieu Poirier <mathieu.poirier@...aro.org>
AuthorDate: Tue, 12 Feb 2019 10:16:08 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 14 Feb 2019 15:18:06 -0300

perf cs-etm: Fix wrong return values in error path

Function cs_etm__mem_access() is supposed to return a u32 but the error
path returns negative values at a couple of places, something that really
throws off the clients using it.  Fix the situation by return '0'.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suzuki K Poulouse <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20190212171618.25355-4-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 1d9419a0cf0c..f396fee9bb95 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -324,7 +324,7 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u64 address,
 	struct	 addr_location al;
 
 	if (!etmq)
-		return -1;
+		return 0;
 
 	machine = etmq->etm->machine;
 	cpumode = cs_etm__cpu_mode(etmq, address);
@@ -332,7 +332,7 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u64 address,
 	thread = etmq->thread;
 	if (!thread) {
 		if (cpumode != PERF_RECORD_MISC_KERNEL)
-			return -EINVAL;
+			return 0;
 		thread = etmq->etm->unknown_thread;
 	}