linux-kernel - Re: linux-next: build failure after merge of the perf tree

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Message-ID: <CAP-5=fVdM0mgZpdgZBMUEvxyfGjPw65_-b_Pj5yLZN8Ddp1a8A@mail.gmail.com>
Date:   Mon, 29 May 2023 19:16:54 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the perf tree

On Mon, May 29, 2023 at 4:05 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the perf tree, today's linux-next build (powerpc perf)
> failed like this:
>
> arch/powerpc/util/kvm-stat.c: In function 'kvm_add_default_arch_event':
> arch/powerpc/util/kvm-stat.c:207:21: error: implicit declaration of function 'pmu_have_event'; did you mean 'perf_pmu__have_event'? [-Werror=implicit-function-declaration]
>   207 |                 if (pmu_have_event("trace_imc", "trace_cycles")) {
>       |                     ^~~~~~~~~~~~~~
>       |                     perf_pmu__have_event
>
> Caused by commit
>
>   1eaf496ed386 ("perf pmu: Separate pmu and pmus")
>
> I have used the perf tree from next-20230525 for today.

Apologies, the function was renamed to perf_pmus__have_event. I've
sent out a patch and confirmed this was the only issue on a cross
compile build with "NO_LIBELF=1 NO_LIBTRACEEVENT=1".

The 1-liner fix is here:
https://lore.kernel.org/lkml/20230530021433.3107580-1-irogers@google.com/

Thanks,
Ian



> --
> Cheers,
> Stephen Rothwell