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From:   Rolf Eike Beer <eb@emlix.com>
To:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>
Cc:     linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: perf patches needed for 4.19 stable
Date:   Tue, 13 Sep 2022 09:17:55 +0200
Message-ID: <4425509.LvFx2qVVIh@mobilepool36.emlix.com>
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From: Rolf Eike Beer <eb@emlix.com>
Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: perf patches needed for 4.19 stable
Date: Tue, 13 Sep 2022 09:17:55 +0200
Message-ID: <4425509.LvFx2qVVIh@mobilepool36.emlix.com>
MIME-Version: 1.0

Greetings,

I had to compile perf for a 4.19 kernel with gcc 10.4 and glibc 2.36. It=20
failed because some patches seem to be missing there.

I have identified these 2 at least:

ebcb9464a2ae3a547e97de476575c82ece0e93e2
perf env: Do not return pointers to local variables

d08c84e01afa7a7eee6badab25d5420fa847f783
perf sched: Cast PTHREAD_STACK_MIN to int as it may turn into=20
sysconf(__SC_THREAD_STACK_MIN_VALUE)

The former was introduced in 5.7, the latter in 5.14, so backports to 5.4 a=
nd=20
5.10 may also be missing.

At the end the build still has failed because of this:

In file included from /opt/emlix/master/sysroot/usr/include/stdio.h:906,
                 from /tmp/e2/build/linux-4.19.254/tools/lib/traceevent/eve=
nt-
parse.h:25,
                 from util/session.c:5:
In function 'printf',
    inlined from 'regs_dump__printf' at util/session.c:968:3,
    inlined from 'regs__printf' at util/session.c:996:2:
/opt/emlix/master/sysroot/usr/include/bits/stdio2.h:86:10: warning: '%-5s'=
=20
directive argument is null [-Wformat-overflow=3D]
   86 |   return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pac=
k=20
());

I was not able to identify a patch for that, so I went with WERROR=3D0, but=
=20
maybe someone knows how to get that fixed as well.

If you agree that these should be added to stable please either send them=20
there or tell me to do so.

Regards,

Eike
=2D-=20
Rolf Eike Beer, emlix GmbH, https://www.emlix.com
=46on +49 551 30664-0, Fax +49 551 30664-11
Gothaer Platz 3, 37083 G=C3=B6ttingen, Germany
Sitz der Gesellschaft: G=C3=B6ttingen, Amtsgericht G=C3=B6ttingen HR B 3160
Gesch=C3=A4ftsf=C3=BChrung: Heike Jordan, Dr. Uwe Kracke =E2=80=93 Ust-IdNr=
=2E: DE 205 198 055

emlix - smart embedded open source
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