linux-kernel - Re: [PATCH v1 6/6] perf build: Enable -Wthread-safety with clang

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Date:   Thu, 18 Aug 2022 08:59:01 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...lia.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Weiguo Li <liwg06@...mail.com>,
        Pavithra Gurushankar <gpavithrasha@...il.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
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        Wenyu Liu <liuwenyu7@...wei.com>,
        Hewenliang <hewenliang4@...wei.com>,
        yaowenbin <yaowenbin1@...wei.com>,
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        Andrii Nakryiko <andrii@...nel.org>,
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        Colin Ian King <colin.king@...el.com>,
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        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zechuan Chen <chenzechuan1@...wei.com>,
        Jason Wang <wangborong@...rlc.com>,
        Lexi Shao <shaolexi@...wei.com>,
        Remi Bernon <rbernon@...eweavers.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v1 6/6] perf build: Enable -Wthread-safety with clang

On Thu, Aug 18, 2022 at 6:17 AM Ian Rogers <irogers@...gle.com> wrote:
>
> On Wed, Aug 17, 2022, 11:11 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > Hi Ian,
> >
> > On Tue, Aug 16, 2022 at 10:39 PM Ian Rogers <irogers@...gle.com> wrote:
> > >
> > > If building with clang then enable -Wthread-safety warnings.
> >
> > Do you know the minimal supported version for the option?
> > I'm not sure we have a check for that kind of thing.
>
>
> It has been supported for a long time, close to 10 years. Looking
> around it looks like clang 3.5 had the support. For context, BPF was
> supported after clang 3.7. Given this long support, and we don't
> version check for BPF, I think it is okay to assume the flag is
> supported.

Good, thanks for checking it.