On Tue, Nov 30, 2021 at 12:14 AM Waiman Long [off-list ref] wrote:

All the calls to mod_objcg_mlstate(), get_obj_stock() and put_obj_stock()
are done by functions defined within the same "#ifdef CONFIG_MEMCG_KMEM"
compilation block. When CONFIG_MEMCG_KMEM isn't defined, the following
compilation warnings will be issued [1] and [2].

  mm/memcontrol.c:785:20: warning: unused function 'mod_objcg_mlstate'
  mm/memcontrol.c:2113:33: warning: unused function 'get_obj_stock'

Fix these warning by moving those functions to under the same
CONFIG_MEMCG_KMEM compilation block. There is no functional change.

[1] https://lore.kernel.org/lkml/202111272014.WOYNLUV6-lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org/
[2] https://lore.kernel.org/lkml/202111280551.LXsWYt1T-lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org/

Fixes: 559271146efc ("mm/memcg: optimize user context object stock access")
Fixes: 68ac5b3c8db2 ("mm/memcg: cache vmstat data in percpu memcg_stock_pcp")
Reported-by: kernel test robot <redacted>
Signed-off-by: Waiman Long <redacted>

Reviewed-by: Muchun Song <redacted>

Thanks.