Re: linux-next: build warning after merge of the tip tree

Yafang Shao
2021-09-20T06:56:07Z

On Mon, Sep 20, 2021 at 9:33 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> Hi all,
>
> After merging the tip tree, today's linux-next build (powerpc_ppc64
> defconfig) produced this warning:
>
> kernel/sched/debug.c: In function 'print_cfs_group_stats':
> kernel/sched/debug.c:460:41: warning: unused variable 'stats' [-Wunused-variable]
> 460 | struct sched_statistics *stats = __schedstats_from_se(se);
> | ^~~~~
>
> Caused by commit
>
> cb3e971c435d ("sched: Make struct sched_statistics independent of fair sched class")
>
> # CONFIG_SCHEDSTATS is not set
>

Hi Stephen,

Thanks for the report.

We have discussed this issue before[1].
This warning happens when CONFIG_SCHEDSTATS is not set and
schedstat_enabled() is 0, so the whole scope should be not compiled.
It seems that we don't need to fix this warning.

[1]. https://lore.kernel.org/lkml/20210911082505.115758-1-laoar.shao@gmail.com/

--
Thanks
Yafang