On Mon, Sep 20, 2021 at 9:33 AM Stephen Rothwell [off-list ref] 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/ (local)

-- 
Thanks
Yafang