On Wed 24-08-16 10:22:43, 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.
Thanks for fixing that! Could you please move the function to the same
ifdef section as its users please.
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: 1f47b61fb407 ("mm: memcontrol: fix swap counter leak on swapout from offline cgroup")
Anyway
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> mm/memcontrol.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 2ff0289ad061..e8d787163b65 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4082,6 +4082,7 @@ static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n)
> atomic_add(n, &memcg->id.ref);
> }
>
> +#ifdef CONFIG_MEMCG_SWAP
> static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
> {
> while (!atomic_inc_not_zero(&memcg->id.ref)) {
> @@ -4099,6 +4100,7 @@ static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
> }
> return memcg;
> }
> +#endif
>
> static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
> {
> --
> 2.9.0
>
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--
Michal Hocko
SUSE Labs
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