Re: [PATCH] perf tools: Fix perf_env__find_bpf_prog_info rb tree lookup

[Jiri Olsa <jolsa@redhat.com>]

On Tue, Apr 16, 2019 at 08:25:17PM +0000, Song Liu wrote:
> 
> 
> > On Apr 16, 2019, at 7:37 AM, Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> wrote:
> > 
> > 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
> 
> Thanks Jiri and Arnaldo!
> 
> I think we will need similar fix for perf_env__find_btf(). 

right, I'll post it

thanks,
jirka