linux-kernel - Re: next: perf: 32-bit: bench/sched-seccomp-notify.c:139:24: error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'uint64

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Date:   Mon, 3 Jul 2023 12:16:55 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, bpf <bpf@...r.kernel.org>,
        Andrei Vagin <avagin@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: next: perf: 32-bit: bench/sched-seccomp-notify.c:139:24: error:
 format '%lu' expects argument of type 'long unsigned int', but argument 2
 has type 'uint64_t'

On Mon, Jul 03, 2023 at 12:55:59PM +0530, Naresh Kamboju wrote:
> Following build regressions noticed on Linux next-20230703.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> 
> Regressions found on i386:
> 
>   - build/gcc-11-lkftconfig-perf
> 
> Regressions found on arm:
> 
>   - build/gcc-10-lkftconfig-perf
>   - build/gcc-11-lkftconfig-perf
> 
> Build error:
> =======
> bench/sched-seccomp-notify.c: In function 'bench_sched_seccomp_notify':
> bench/sched-seccomp-notify.c:139:24: error: format '%lu' expects
> argument of type 'long unsigned int', but argument 2 has type
> 'uint64_t' {aka 'long long unsigned int'} [-Werror=format=]
>   139 |   printf("# Executed %lu system calls\n\n",
>       |                      ~~^
>       |                        |
>       |                        long unsigned int
>       |                      %llu
>   140 |    loops);
>       |    ~~~~~
>       |    |
>       |    uint64_t {aka long long unsigned int}
> cc1: all warnings being treated as errors
> make[4]: *** [tools/build/Makefile.build:97:
> /home/tuxbuild/.cache/tuxmake/builds/1/build/bench/sched-seccomp-notify.o]
> Error 1

Thanks! I've updated the format string to use "%"PRIu64 now.

-Kees

> 
> Links:
>  - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230703/testrun/18069798/suite/build/test/gcc-10-lkftconfig-perf/history/
> 
> 
> --
> Linaro LKFT
> https://lkft.linaro.org

-- 
Kees Cook