linux-kernel - Re: [PATCH v1] perf cpumap: Increment reference count for online cpumap

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Message-Id: <174248644166.3704425.11921703615469719002.b4-ty@kernel.org>
Date: Thu, 20 Mar 2025 09:00:41 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, 
 John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>, 
 Leo Yan <leo.yan@...ux.dev>, Peter Zijlstra <peterz@...radead.org>, 
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Kan Liang <kan.liang@...ux.intel.com>, Howard Chu <howardchu95@...il.com>, 
 Levi Yun <yeoreum.yun@....com>, 
 "Dr. David Alan Gilbert" <linux@...blig.org>, 
 Thomas Falcon <thomas.falcon@...el.com>, coresight@...ts.linaro.org, 
 linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v1] perf cpumap: Increment reference count for online
 cpumap

On Tue, 18 Mar 2025 10:19:14 -0700, Ian Rogers wrote:
> Thomas Richter <tmricht@...ux.ibm.com> reported a double put on the
> cpumap for the placeholder core PMU:
> https://lore.kernel.org/lkml/20250318095132.1502654-3-tmricht@linux.ibm.com/
> Requiring the caller to get the cpumap is not how these things are
> usually done, switch cpu_map__online to do the get and then fix up any
> use cases where a put is needed.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung