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Date:   Mon, 27 Nov 2023 21:48:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>, Namhyung Kim <namhyung@...nel.org>
Cc:     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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Colin Ian King <colin.i.king@...il.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Ming Wang <wangming01@...ngson.cn>,
        James Clark <james.clark@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        German Gomez <german.gomez@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
        Sandipan Das <sandipan.das@....com>,
        liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v4 01/53] perf comm: Use regular mutex

Em Mon, Nov 27, 2023 at 06:53:19PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Sun, Nov 05, 2023 at 09:31:47AM -0800, Namhyung Kim escreveu:
> > Hi Ian,
> > 
> > On Thu, Nov 2, 2023 at 10:58 AM Ian Rogers <irogers@...gle.com> wrote:
> > >
> > > The rwsem is only after used for writing so switch to a mutex that has
> > > better error checking.
> > 
> > Hmm.. ok.  It doesn't make sense to use rwsem without readers.
> 
> Well, the only reader is a findnew method, that will primarily read,
> but possibly write if it doesn't find it there, so converting to a
> regular mutex seems sensible.

To be fixed tomorrow:

   3    32.71 alpine:3.15                   : FAIL gcc version 10.3.1 20211027 (Alpine 10.3.1_git20211027)
    util/comm.c:20:46: error: 'PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP' undeclared here (not in a function)
       20 | static struct mutex comm_str_lock = {.lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,};
          |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [/git/perf-6.6.0-rc1/tools/build/Makefile.build:158: util] Error 2
   4    32.17 alpine:3.16                   : FAIL gcc version 11.2.1 20220219 (Alpine 11.2.1_git20220219)
    util/comm.c:20:46: error: 'PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP' undeclared here (not in a function)
       20 | static struct mutex comm_str_lock = {.lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,};
          |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [/git/perf-6.6.0-rc1/tools/build/Makefile.build:158: util] Error 2
   5    25.82 alpine:3.17                   : FAIL gcc version 12.2.1 20220924 (Alpine 12.2.1_git20220924-r4)
    util/comm.c:20:46: error: 'PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP' undeclared here (not in a function)
       20 | static struct mutex comm_str_lock = {.lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,};
          |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [/git/perf-6.6.0-rc1/tools/build/Makefile.build:158: util] Error 2
   6    26.64 alpine:3.18                   : FAIL gcc version 12.2.1 20220924 (Alpine 12.2.1_git20220924-r10)
    util/comm.c:20:46: error: 'PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP' undeclared here (not in a function)
       20 | static struct mutex comm_str_lock = {.lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,};
          |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [/git/perf-6.6.0-rc1/tools/build/Makefile.build:158: util] Error 2
   7    29.66 alpine:edge                   : FAIL gcc version 13.1.1 20230722 (Alpine 13.1.1_git20230722)
    util/comm.c:20:46: error: 'PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP' undeclared here (not in a function)
       20 | static struct mutex comm_str_lock = {.lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,};
          |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [/git/perf-6.6.0-rc1/tools/build/Makefile.build:158: util] Error 2


 I.e. doesn't play well with musl libc.

 - Arnaldo

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