Subject: Re: linux-next: build failure after merge of the perf tree

From: Anshuman Khandual <[email-masked]>
Date: Thu, 1 Sep 2022 10:41:46 +0530

Hello Stephen,

This seems to be the same problem as pointed by ACME on the patch series [1].
Could this be a compiler false positive ? Because the new code block is exact
same like the existing one. This warning seems to only occurs on powerpc64el
platform, but not on others.

[1] https://lore.kernel.org/lkml/[email-masked]/

- Anshuman

On 8/31/22 04:04, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the perf tree, today's linux-next build (native perf)
> failed like this:
> 
> In file included from /usr/include/stdio.h:866,
>                  from /home/sfr/next/next/tools/perf/util/branch.h:9,
>                  from util/branch.c:2:
> In function 'fprintf',
>     inlined from 'branch_type_stat_display' at util/branch.c:152:4:
> /usr/include/powerpc64le-linux-gnu/bits/stdio2.h:105:10: error: '%8s' directive argument is null [-Werror=format-overflow=]
>   105 |   return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   106 |                         __va_arg_pack ());
>       |                         ~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> Presumably caused by commit
> 
>   9781e500dcb8 ("perf branch: Extend branch type classification")
> 
> "native" here is PowerPC64 LE.
> $ gcc --version
> gcc (Debian 11.2.0-10) 11.2.0
> 
> I have used the perf tree from next-20220830 for today.
>