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 22:23:41 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     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>,
        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=]

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")

> 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

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