Re: linux-next: build failure after merge of the akpm-current tree

[Arnd Bergmann]

On Thu, Jul 11, 2019 at 2:41 AM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
>
> From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
> Subject: mm: shrinker: make shrinker not depend on memcg kmem
>
> Currently shrinker is just allocated and can work when memcg kmem is
> enabled.  But, THP deferred split shrinker is not slab shrinker, it
> doesn't make too much sense to have such shrinker depend on memcg kmem.
> It should be able to reclaim THP even though memcg kmem is disabled.
>
> Introduce a new shrinker flag, SHRINKER_NONSLAB, for non-slab shrinker.
> When memcg kmem is disabled, just such shrinkers can be called in
> shrinking memcg slab.
>

Today's linux-next again fails without CONFIG_MEMCG_KMEM:

mm/vmscan.c:220:7: error: implicit declaration of function
'memcg_expand_shrinker_maps' [-Werror,-Wimplicit-function-declaration]
                if (memcg_expand_shrinker_maps(id)) {
                    ^
mm/vmscan.c:608:56: error: no member named 'shrinker_map' in 'struct
mem_cgroup_per_node'
        map = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_map,
                                        ~~~~~~~~~~~~~~~~~~~~  ^

     Arnd