Re: [PATCH] fixup: vmscan: Fix build on !CONFIG_MEMCG from nr_deactivate changes

[Kirill Tkhai]

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 âshrink_active_listâ:
>     mm/vmscan.c:2101:2: error: implicit declaration of function â__count_memcg_eventsâ; did you mean âcount_memcg_eventsâ? [-Werror=implicit-function-declaration]
> 
> This fixup makes it build with !CONFIG_MEMCG.

Yeah, thanks, Chris.

> Signed-off-by: Chris Down <chris@xxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: cgroups@xxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Cc: kernel-team@xxxxxx
> ---
>  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)
>  {
>