linux-kernel - Re: [PATCH] perf annotate: Fix data type profiling on stdio

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Date: Tue, 23 Apr 2024 09:57:12 -0700
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf annotate: Fix data type profiling on stdio

On Mon, Apr 22, 2024 at 7:06 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The loop in hists__find_annotations() never set the 'nd' pointer to NULL
> and it makes stdio output repeating the last element forever.  I think
> it doesn't set to NULL for TUI to prevent it from exiting unexpectedly.
> But it should just set on stdio mode.
>
> Fixes: d001c7a7f473 ("perf annotate-data: Add hist_entry__annotate_data_tui()")
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Ian Rogers <irogers@...gle.com>

Should we have a test to cover things like this?

Thanks,
Ian

> ---
>  tools/perf/builtin-annotate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 6f7104f06c42..83812b9d5363 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -491,7 +491,7 @@ static void hists__find_annotations(struct hists *hists,
>                                 return;
>                         }
>
> -                       if (next != NULL)
> +                       if (use_browser == 0 || next != NULL)
>                                 nd = next;
>
>                         continue;
> --
> 2.44.0.769.g3c40516874-goog
>