linux-kernel - Re: [PATCH perf/core] perf intel-pt: Fix clang build failure in intel_pt_synth_pebs

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Date:   Fri, 15 May 2020 13:43:31 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH perf/core] perf intel-pt: Fix clang build failure in
 intel_pt_synth_pebs_sample

Em Fri, May 15, 2020 at 01:41:53PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, May 14, 2020 at 07:10:25PM -0500, Gustavo A. R. Silva escreveu:
> > On Thu, May 14, 2020 at 03:46:05PM -0700, Ian Rogers wrote:
> > > On Thu, May 14, 2020 at 3:04 PM Gustavo A. R. Silva
> > > <gustavoars@...nel.org> wrote:
> > 
> > Yep. I just built linux-next --which contains all the flexible-array
> > conversions-- with Clang --GCC doesn't catch this issue, not even GCC
> > 10-- and I don't see any other issue like this.
> > 
> > I mean, I have run into these other two:
> > 
> > https://lore.kernel.org/lkml/20200505235205.GA18539@embeddedor/
> > https://lore.kernel.org/lkml/20200508163826.GA768@embeddedor/
> > 
> > but those are due to the erroneous application of the sizeof operator
> > to zero-length arrays.
> > 
> > > complicated stack allocation I suggested. It may be nice to save
> > > cycles if code this pattern is widespread and the code hot.
> > > 
> > 
> > Apparently, this is the only instace of this sort of issue in the whole
> > codebase.
> 
> Adrian Hunter was not CCed, Adrian?

Gustavo, I've removed this from my tree from now till this gets
resolved.

- Arnaldo