linux-kernel - Re: [PATCH v3] perf evlist: Fix evlist__new

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Date: Fri, 26 Jan 2024 13:25:31 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: James Clark <james.clark@....com>
Cc: Namhyung Kim <namhyung@...nel.org>, linux-perf-users@...r.kernel.org,
	irogers@...gle.com, kan.liang@...ux.intel.com, mark.rutland@....com,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Changbin Du <changbin.du@...wei.com>,
	Yang Jihong <yangjihong1@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf evlist: Fix evlist__new_default() for > 1 core
 PMU

Em Wed, Jan 24, 2024 at 09:03:57AM +0000, James Clark escreveu:
> On 24/01/2024 00:46, Namhyung Kim wrote:
> > On Tue, Jan 23, 2024 at 2:39 AM James Clark <james.clark@....com> wrote:
> >> +++ b/tools/perf/util/evlist.c
> >> @@ -106,6 +106,13 @@ struct evlist *evlist__new_default(void)
> >>                 evlist = NULL;
> >>         }

> >> +       if (evlist->core.nr_entries > 1) {

> > I think you need a NULL check for evlist here.
 
> Oops yes. Or just return on the error above.

Was there a v4? I'm assuming this is for perf-tools, i.e. for v6.8-rc,
right?

- Arnaldo