linux-kernel - Re: [PATCH] mm/memcg: Relocate mod_objcg_mlstate(), get_obj_stock() and put_obj

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Date:   Tue, 30 Nov 2021 10:36:07 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] mm/memcg: Relocate mod_objcg_mlstate(), get_obj_stock()
 and put_obj_stock()

On Tue, Nov 30, 2021 at 12:14 AM Waiman Long <longman@...hat.com> 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@intel.com/
> [2] https://lore.kernel.org/lkml/202111280551.LXsWYt1T-lkp@intel.com/
>
> 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 <lkp@...el.com>
> Signed-off-by: Waiman Long <longman@...hat.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.