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

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On Tue, 9 Jul 2019 21:15:59 +1000 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:

> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
> 
> arm-linux-gnueabi-ld: mm/list_lru.o: in function `list_lru_add':
> list_lru.c:(.text+0x1a0): undefined reference to `memcg_set_shrinker_bit'
> 
> Caused by commit
> 
>   ca37e9e5f18d ("mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2")
> 
> CONFIG_MEMCG is not set for this build.
> 
> I have reverted that commit for today.

Thanks.  This, I suppose:

--- a/include/linux/memcontrol.h~mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2-fix
+++ a/include/linux/memcontrol.h
@@ -1259,6 +1259,8 @@ static inline bool mem_cgroup_under_sock
 	} while ((memcg = parent_mem_cgroup(memcg)));
 	return false;
 }
+extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
+                                  int nid, int shrinker_id);
 #else
 #define mem_cgroup_sockets_enabled 0
 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
@@ -1267,6 +1269,10 @@ static inline bool mem_cgroup_under_sock
 {
 	return false;
 }
+static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
+					  int nid, int shrinker_id)
+{
+}
 #endif
 
 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
_




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