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

[Yafang Shao]

On Mon, Sep 20, 2021 at 9:33 AM Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> 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@xxxxxxxxx/

-- 
Thanks
Yafang