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Message-ID: <CAJ9a7VjnOw_XgFXmOgE7ufB98_VNEZH7vX=8yO5qrogoBqJQXw@mail.gmail.com>
Date: Thu, 6 Feb 2020 11:48:29 +0000
From: Mike Leach <mike.leach@...aro.org>
To: Leo Yan <leo.yan@...aro.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel@...r.kernel.org,
Robert Walker <robert.walker@....com>,
Coresight ML <coresight@...ts.linaro.org>
Subject: Re: [PATCH v3 5/5] perf cs-etm: Fix unsigned variable comparison to zero
Reviewed by: Mike Leach <mike.leach@...aro.org>
On Mon, 3 Feb 2020 at 01:53, Leo Yan <leo.yan@...aro.org> wrote:
>
> 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>
> ---
> 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 dbddf1eec2be..720108bd8dba 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -945,7 +945,7 @@ 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--;
> --
> 2.17.1
>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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