linux-kernel - Re: "perf ftrace" segfault because ->cpus!=NULL but ->all

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Message-ID: <20200109125944.GS15478@tassilo.jf.intel.com>
Date:   Thu, 9 Jan 2020 04:59:44 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jann Horn <jannh@...gle.com>,
        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>,
        Namhyung Kim <namhyung@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: "perf ftrace" segfault because ->cpus!=NULL but ->all_cpus==NULL

> oops, ftrace is using evlist without event ;-) so all_cpus
> will not get initialized..
> 
> Andi, should we initialize evlist::all_cpus with the first
> cpus we get, like in the patch below?

I assume perf stat -A still works for all CPUs? If yes it's ok.

-andi