linux-kernel - Re: [next] perf build failures: libbpf.c:10946:50: error: format '%li' expects argument of type 'long int *', but argument 4 has type 'size_t *' {aka 'unsigned int *'} [-Werror=format=]

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Date:   Thu, 7 Apr 2022 08:57:38 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        perf-users <perf-users@...aro.org>, lkft-triage@...ts.linaro.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        NeilBrown <neilb@...e.de>, tanu235m@...il.com,
        Matthew Wilcox <willy@...radead.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Dave Marchevsky <davemarchevsky@...com>
Subject: Re: [next] perf build failures: libbpf.c:10946:50: error: format
 '%li' expects argument of type 'long int *', but argument 4 has type 'size_t
 *' {aka 'unsigned int *'} [-Werror=format=]

On Thu, Apr 7, 2022 at 5:23 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi Naresh,
>
> On Thu, 7 Apr 2022 15:46:53 +0530 Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> >
> > perf build errors on i386 [1] on Linux next-20220407 [2]
> >
> > usdt.c:1181:5: error: "__x86_64__" is not defined, evaluates to 0
> > [-Werror=undef]
> >  1181 | #if __x86_64__
> >       |     ^~~~~~~~~~
> > usdt.c:1196:5: error: "__x86_64__" is not defined, evaluates to 0
> > [-Werror=undef]
> >  1196 | #if __x86_64__
> >       |     ^~~~~~~~~~
> > cc1: all warnings being treated as errors
>
> Caused by commit
>
>   4c59e584d158 ("libbpf: Add x86-specific USDT arg spec parsing logic")
>
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/util/values.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/tests/backward-ring-buffer.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/tests/sdt.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/tests/is_printable_array.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/util/debug.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/util/fncache.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/tests/bitmap.o
> >   CC      /home/tuxbuild/.cache/tuxmake/builds/1/build/util/machine.o
> > libbpf.c: In function 'attach_uprobe':
> > libbpf.c:10946:50: error: format '%li' expects argument of type 'long
> > int *', but argument 4 has type 'size_t *' {aka 'unsigned int *'}
> > [-Werror=format=]
> > 10946 |         n = sscanf(func_name, "%m[a-zA-Z0-9_.]+%li", &func, &offset);
> >       |                                                ~~^          ~~~~~~~
> >       |                                                  |          |
> >       |                                                  long int *
> > size_t * {aka unsigned int *}
> >       |                                                %i
> > cc1: all warnings being treated as errors
>
> Caused by commit
>
>   39f8dc43b7a0 ("libbpf: Add auto-attach for uprobes based on section name")
>

My bad, I'll fix both issues in bpf-next and will send a fix today.
Thanks for letting me know!

> > metadata:
> >   git_ref: master
> >   git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
> >   git_sha: 2e9a9857569ec27e64d2ddd01294bbe3c736acb1
> >   git_describe: next-20220407
> >   kernel-config: https://builds.tuxbuild.com/27SL0lCnWoPP04Jn8zKQ5nEEX7i/config
> >   target_arch: i386
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> >
> > --
> > Linaro LKFT
> > https://lkft.linaro.org
> >
> >
> > [1] https://builds.tuxbuild.com/27SL0lCnWoPP04Jn8zKQ5nEEX7i/
> > [2] https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/jobs/2302706510
>
> --
> Cheers,
> Stephen Rothwell