linux-kernel - Re: [PATCH v1 0/8] Update to C11, fix signal undefined behavior

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Date:   Mon, 24 Oct 2022 16:36:07 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Leo Yan <leo.yan@...aro.org>,
        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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v1 0/8] Update to C11, fix signal undefined behavior

Em Mon, Oct 24, 2022 at 10:59:03AM -0700, Ian Rogers escreveu:
> On Mon, Oct 24, 2022 at 10:51 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > Em Mon, Oct 24, 2022 at 10:35:15AM -0700, Ian Rogers escreveu:
> > > The use of C11 is mainstream in the kernel [1]. There was some
> > > confusion on volatile and signal handlers in [2]. Switch to using
> > > stdatomic.h (requires C11) and sig_atomic_t as per [3]. Thanks to Leo
> > > Yan <leo.yan@...aro.org> for the suggestions.
> > >
> > > [1] https://lore.kernel.org/lkml/CAHk-=whWbENRz-vLY6vpESDLj6kGUTKO3khGtVfipHqwewh2HQ@mail.gmail.com/
> > > [2] https://lore.kernel.org/lkml/20221024011024.462518-1-irogers@google.com/
> > > [3] https://wiki.sei.cmu.edu/confluence/display/c/SIG31-C.+Do+not+access+shared+objects+in+signal+handlers
> >
> > I think I'll apply this to perf/core, i.e. for 6.3, ok?
> 
> Sounds good to me. 6.3 or 6.2? I suspect there is more cleanup like
> this and to the iterators (from C11) that can be done.

oops, 6.2, sure, 6.1 is the current one, merge window closed. :-)

- Arnaldo