linux-kernel - Re: [PATCH] perf tools: Fix perf_env__find_bpf_prog

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Date:   Tue, 16 Apr 2019 11:37:48 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Song Liu <songliubraving@...com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf tools: Fix perf_env__find_bpf_prog_info rb tree
 lookup

Em Tue, Apr 16, 2019 at 11:35:54AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Apr 16, 2019 at 04:34:52PM +0200, Jiri Olsa escreveu:
> > On Tue, Apr 16, 2019 at 11:20:28AM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Tue, Apr 16, 2019 at 03:41:51PM +0200, Jiri Olsa escreveu:
> > > > We currently don't return NULL in case we don't find
> > > > the bpf_prog_info_node, fixing that.
> > > 
> > > Can you please try to figure out what was the changeset that introduced
> > > this problem so that we can have a Fixes: tag that helps me determine if
> > > this should go to perf/urgent (likely) or (perf/core) and to help the
> > > stable guys as well?
> > 
> > sry, I keep forgetting this..
> > 
> > Fixes: e4378f0cb90b ("perf bpf: Save bpf_prog_info in a rbtree in perf_env")
> 
> I had just added:
> 
> Fixes: e4378f0cb90b ("perf bpf: Save bpf_prog_info in a rbtree in perf_env")
> 
> matches, good :-)
> 
> At firts I thought hey the look checks for NULL, then, hey, different
> variable... good catch!

Ah, I also changed the summary from:

   "perf tools: Fix perf_env__find_bpf_prog_info rb tree"

to:

  perf bpf: Return NULL when RB tree lookup fails in perf_env__find_bpf_prog_info()

Thanks,

- Arnaldo