linux-kernel - [tip:perf/urgent] perf cs-etm: Don't check cs_etm_queue::prev

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Date:   Thu, 2 May 2019 22:56:22 -0700
From:   tip-bot for Leo Yan <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...hat.com, leo.yan@...aro.org, acme@...hat.com,
        hpa@...or.com, linux-kernel@...r.kernel.org,
        mathieu.poirier@...aro.org, alexander.shishkin@...ux.intel.com,
        suzuki.poulose@....com, tglx@...utronix.de, mingo@...nel.org,
        namhyung@...nel.org, robert.walker@....com, mike.leach@...aro.org
Subject: [tip:perf/urgent] perf cs-etm: Don't check
 cs_etm_queue::prev_packet validity

Commit-ID:  cf0c37b6dbf74fb71bea07b516612d29e00dcbc4
Gitweb:     https://git.kernel.org/tip/cf0c37b6dbf74fb71bea07b516612d29e00dcbc4
Author:     Leo Yan <leo.yan@...aro.org>
AuthorDate: Sun, 28 Apr 2019 16:32:28 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 2 May 2019 16:00:20 -0400

perf cs-etm: Don't check cs_etm_queue::prev_packet validity

Since cs_etm_queue::prev_packet is allocated for all cases, it will
never be NULL pointer; now validity checking prev_packet is pointless,
remove all of them.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Tested-by: Robert Walker <robert.walker@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20190428083228.20246-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 110804936fc3..7777cfc1ad8c 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -981,7 +981,6 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
 	 * PREV_PACKET is a branch.
 	 */
 	if (etm->synth_opts.last_branch &&
-	    etmq->prev_packet &&
 	    etmq->prev_packet->sample_type == CS_ETM_RANGE &&
 	    etmq->prev_packet->last_instr_taken_branch)
 		cs_etm__update_last_branch_rb(etmq);
@@ -1014,7 +1013,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
 		etmq->period_instructions = instrs_over;
 	}
 
-	if (etm->sample_branches && etmq->prev_packet) {
+	if (etm->sample_branches) {
 		bool generate_sample = false;
 
 		/* Generate sample for tracing on packet */
@@ -1071,9 +1070,6 @@ static int cs_etm__flush(struct cs_etm_queue *etmq)
 	struct cs_etm_auxtrace *etm = etmq->etm;
 	struct cs_etm_packet *tmp;
 
-	if (!etmq->prev_packet)
-		return 0;
-
 	/* Handle start tracing packet */
 	if (etmq->prev_packet->sample_type == CS_ETM_EMPTY)
 		goto swap_packet;