linux-kernel - Re: [PATCH v5 11/17] perf: Simplify get_perf

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Message-ID: <20250424134727.0e8fd0ce@gandalf.local.home>
Date: Thu, 24 Apr 2025 13:47:27 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Andrew Morton
 <akpm@...ux-foundation.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org, Ingo Molnar <mingo@...nel.org>, Arnaldo Carvalho de Melo
 <acme@...nel.org>, Indu Bhagat <indu.bhagat@...cle.com>, Alexander Shishkin
 <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, Adrian
 Hunter <adrian.hunter@...el.com>, linux-perf-users@...r.kernel.org, Mark
 Brown <broonie@...nel.org>, linux-toolchains@...r.kernel.org, Jordan Rome
 <jordalgo@...a.com>, Sam James <sam@...too.org>, Andrii Nakryiko
 <andrii.nakryiko@...il.com>, Jens Remus <jremus@...ux.ibm.com>, Florian
 Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org>, Weinan Liu
 <wnliu@...gle.com>, Blake Jones <blakejones@...gle.com>, Beau Belgrave
 <beaub@...ux.microsoft.com>, "Jose E. Marchesi" <jemarch@....org>
Subject: Re: [PATCH v5 11/17] perf: Simplify get_perf_callchain() user logic

On Thu, 24 Apr 2025 13:42:16 -0400
Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> The case I'd be careful about is if the code can nest over exit_mm()
> (e.g. interrupt) after it sets current->mm = NULL.

Then probably we should always check if current->mm is non-NULL before
using it then, and not rely on just task->flags.

-- Steve