On Wed, Aug 24, 2016 at 10:22:43AM +0200, Arnd Bergmann wrote:

A bugfix in v4.8-rc2 introduced a harmless warning when CONFIG_MEMCG_SWAP
is disabled but CONFIG_MEMCG is enabled:

mm/memcontrol.c:4085:27: error: 'mem_cgroup_id_get_online' defined but not used [-Werror=unused-function]
 static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)

This adds an extra #ifdef that matches the one around the caller to
avoid the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 1f47b61fb407 ("mm: memcontrol: fix swap counter leak on swapout from offline cgroup")

Acked-by: Vladimir Davydov <redacted>

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