linux-kernel - [tip: perf/core] perf cs-etm: Fix unsigned variable comparison to zero

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Message-ID: <158462704338.28353.16418800886208337652.tip-bot2@tip-bot2>
Date:   Thu, 19 Mar 2020 14:10:43 -0000
From:   "tip-bot2 for Leo Yan" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Robert Walker <robert.walker@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        coresight ml <coresight@...ts.linaro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/core] perf cs-etm: Fix unsigned variable comparison to zero

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     bc010dd657ee0309276c88ab828b9ad156f75b31
Gitweb:        https://git.kernel.org/tip/bc010dd657ee0309276c88ab828b9ad156f75b31
Author:        Leo Yan <leo.yan@...aro.org>
AuthorDate:    Wed, 19 Feb 2020 10:18:11 +08:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Wed, 11 Mar 2020 10:48:44 -03:00

perf cs-etm: Fix unsigned variable comparison to zero

The variable 'offset' in function cs_etm__sample() is u64 type, it's not
appropriate to check it with 'while (offset > 0)'; this patch changes to
'while (offset)'.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Mike Leach <mike.leach@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Robert Walker <robert.walker@....com>
Cc: Suzuki Poulouse <suzuki.poulose@....com>
Cc: coresight ml <coresight@...ts.linaro.org>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lore.kernel.org/lkml/20200219021811.20067-6-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 87d9943..62d2f9b 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -962,7 +962,7 @@ static inline u64 cs_etm__instr_addr(struct cs_etm_queue *etmq,
 	if (packet->isa == CS_ETM_ISA_T32) {
 		u64 addr = packet->start_addr;
 
-		while (offset > 0) {
+		while (offset) {
 			addr += cs_etm__t32_instr_size(etmq,
 						       trace_chan_id, addr);
 			offset--;