linux-kernel - Re: [backport PATCH 0/2] stable v5.15, v5.10 and v5.4: fix perf build errors

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Date:   Thu, 20 Apr 2023 20:24:18 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, acme@...hat.com, andres@...razel.de,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [backport PATCH 0/2] stable v5.15, v5.10 and v5.4: fix perf build errors

On Tue, 18 Apr 2023 at 11:04, Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Mon, Apr 17, 2023 at 02:29:41PM +0200, Anders Roxell wrote:
> > Hi,
> >
> > I would like to see these patches backported. They are needed so perf
> > can be cross compiled with gcc on v5.15, v5.10 and v5.4.
> > I built it with tuxmake [1] here are two example commandlines:
> > tuxmake --runtime podman --target-arch arm64 --toolchain gcc-12 --kconfig defconfig perf
> > tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-12 --kconfig defconfig perf
> >
> > Tried to build perf with both gcc-11 and gcc-12.
> >
> > Patch 'tools perf: Fix compilation error with new binutils'
> > and 'tools build: Add feature test for init_disassemble_info API changes'
> > didn't apply cleanly, thats why I send these in a patchset.
> >
> > When apply 'tools build: Add feature test for
> > init_disassemble_info API changes' to 5.4 it will be a minor merge
> > conflict, do you want me to send this patch in two separate patches one
> > for 5.4 and another for v5.10?
> >
> > The sha for these two patches in mainline are.
> > cfd59ca91467 tools build: Add feature test for init_disassemble_info API changes
> > 83aa0120487e tools perf: Fix compilation error with new binutils
> >
> > The above patches solves these:
> > util/annotate.c: In function 'symbol__disassemble_bpf':
> > util/annotate.c:1729:9: error: too few arguments to function 'init_disassemble_info'
> >  1729 |         init_disassemble_info(&info, s,
> >       |         ^~~~~~~~~~~~~~~~~~~~~
> >
> >
> > Please apply these to v5.10 and v5.4
> > a45b3d692623 tools include: add dis-asm-compat.h to handle version differences
> > d08c84e01afa perf sched: Cast PTHREAD_STACK_MIN to int as it may turn into sysconf(__SC_THREAD_STACK>
> >
> > The above patches solves these:
> > /home/anders/src/kernel/stable-5.10/tools/include/linux/kernel.h:43:24: error: comparison of distinct pointer types lacks a cast [-Werror]
> >    43 |         (void) (&_max1 == &_max2);              \
> >       |                        ^~
> > builtin-sched.c:673:34: note: in expansion of macro 'max'
> >   673 |                         (size_t) max(16 * 1024, PTHREAD_STACK_MIN));
> >       |                                  ^~~
> >
> >
> > Please apply these to v5.15, v5.10 and v5.4
> > 8e8bf60a6754 perf build: Fixup disabling of -Wdeprecated-declarations for the python scripting engine
> > 4ee3c4da8b1b perf scripting python: Do not build fail on deprecation warnings
> > 63a4354ae75c perf scripting perl: Ignore some warnings to keep building with perl headers
>
> Can you please provide patch series of these upstream commits backported
> to the relevant branchs that you wish to see them in?  You have 2
> patches in this series without git commit ids, and I have no idea where
> to apply them, or not apply them...

Yes, apologies, I will get that fixed up.

>
> Or better yet, just use the latest version of perf as was pointed out,
> on these old kernel releases.

Makes sense, we can do this. Is this the preferred way going forward?

Cheers,
Anders