linux-kernel - Re: [PATCH] fixup: vmscan: Fix build on !CONFIG_MEMCG from nr

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Date:   Fri, 22 Mar 2019 18:16:45 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     Chris Down <chris@...isdown.name>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, Tejun Heo <tj@...nel.org>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com
Subject: Re: [PATCH] fixup: vmscan: Fix build on !CONFIG_MEMCG from
 nr_deactivate changes

On 22.03.2019 18:05, Chris Down wrote:
> "mm: move nr_deactivate accounting to shrink_active_list()" uses the
> non-irqsaved version of count_memcg_events (__count_memcg_events), but
> we've only exported the irqsaving version of it to userspace, so the
> build breaks:
> 
>     mm/vmscan.c: In function ‘shrink_active_list’:
>     mm/vmscan.c:2101:2: error: implicit declaration of function ‘__count_memcg_events’; did you mean ‘count_memcg_events’? [-Werror=implicit-function-declaration]
> 
> This fixup makes it build with !CONFIG_MEMCG.

Yeah, thanks, Chris.

> Signed-off-by: Chris Down <chris@...isdown.name>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kirill Tkhai <ktkhai@...tuozzo.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: kernel-team@...com
> ---
>  include/linux/memcontrol.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 534267947664..b226c4bafc93 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1147,6 +1147,12 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
>  {
>  }
>  
> +static inline void __count_memcg_events(struct mem_cgroup *memcg,
> +					enum vm_event_item idx,
> +					unsigned long count)
> +{
> +}
> +
>  static inline void count_memcg_page_event(struct page *page,
>  					  int idx)
>  {
>