linux-kernel - Re: [perf-tools] Build-error in tools/perf/util/annotate.c with LLVM-14

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Date:   Sun, 3 Jul 2022 14:31:03 -0700
From:   Andres Freund <andres@...razel.de>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        Namhyung Kim <namhyung@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [perf-tools] Build-error in tools/perf/util/annotate.c with
 LLVM-14

Hi,

On 2022-07-03 22:40:22 +0200, Sedat Dilek wrote:
> My test-case was to build a Linux v5.19-rc4 plus custom patches
> including your v1 patchset.

> make-line:
> 
> /home/dileks/bin/perf stat make V=1 -j4 LLVM=1 LLVM_IAS=1
> PAHOLE=/opt/pahole/bin/pahole LOCALVERSION=-1-amd64-clang
> 14-lto KBUILD_BUILD_HOST=iniza KBUILD_BUILD_USER=sedat.dilek@...il.com
> KBUILD_BUILD_TIMESTAMP=2022-07-03 bindeb-pkg
> KDEB_PKGVERSION=5.19.0~rc4-1~bookworm+dileks1
> [...]
> Hmmm, it took a bit longer as usual.

I don't think the patches would affect the performance of this workload - I
don't know the kernel build process well, but I don't see why anything in it
would trigger bpf programs to be disassembled? I guess the additional three
feature tests can take a tiny bit of time, but...

Sent out a new version, did add you as a CC.

Greetings,

Andres Freund