linux-kernel - Re: [PATCH] perf: Move debug initialization earlier

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Date:   Thu, 27 May 2021 08:51:41 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Riccardo Mancini <rickyman7@...il.com>
Cc:     Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf: Move debug initialization earlier

On Wed, May 19, 2021 at 9:44 AM Ian Rogers <irogers@...gle.com> wrote:
>
> This avoids segfaults during option handlers that use pr_err. For
> example, "perf --debug nopager list" segfaults before this change.
>
> Fixes: 8abceacff87d (perf debug: Add debug_set_file function)
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Ping.

Thanks!
Ian

> ---
>  tools/perf/perf.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> index 20cb91ef06ff..2f6b67189b42 100644
> --- a/tools/perf/perf.c
> +++ b/tools/perf/perf.c
> @@ -443,6 +443,8 @@ int main(int argc, const char **argv)
>         const char *cmd;
>         char sbuf[STRERR_BUFSIZE];
>
> +       perf_debug_setup();
> +
>         /* libsubcmd init */
>         exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
>         pager_init(PERF_PAGER_ENVIRONMENT);
> @@ -531,8 +533,6 @@ int main(int argc, const char **argv)
>          */
>         pthread__block_sigwinch();
>
> -       perf_debug_setup();
> -
>         while (1) {
>                 static int done_help;
>
> --
> 2.31.1.751.gd2f1c929bd-goog
>