linux-kernel - Re: [PATCH v1] perf sched: Avoid union type punning undefined behavior

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Message-ID: <aN0uxfZAT8pp8svS@x1>
Date: Wed, 1 Oct 2025 10:38:13 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...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>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf sched: Avoid union type punning undefined
 behavior

On Tue, Sep 30, 2025 at 01:05:33PM -0700, Ian Rogers wrote:
> On Sun, Sep 14, 2025 at 11:33 AM Ian Rogers <irogers@...gle.com> wrote:
> >
> > A union is used to set the priv value in thread (a void*) to a boolean
> > value through type punning. Undefined behavior sanitizer fails on this.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Ping.

Thanks, applied to perf-tools-next,

- Arnaldo