On Fri 12-06-20 18:44:37, Chris Down wrote:
> Looks like one of these got missed when massaging in f86b810c2610 ("mm,
> memcg: prevent memory.low load/store tearing") with other linux-mm
> changes.
>
> Reported-by: Michal Koutný <[email protected]>
> Signed-off-by: Chris Down <[email protected]>
Acked-by: Michal Hocko <[email protected]>
> ---
> mm/memcontrol.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 0b38b6ad547d..f7cc66a80348 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -6416,7 +6416,7 @@ enum mem_cgroup_protection mem_cgroup_protected(struct
> mem_cgroup *root,
>
> if (parent == root) {
> memcg->memory.emin = READ_ONCE(memcg->memory.min);
> - memcg->memory.elow = memcg->memory.low;
> + memcg->memory.elow = READ_ONCE(memcg->memory.low);
> goto out;
> }
>
> @@ -6428,7 +6428,8 @@ enum mem_cgroup_protection mem_cgroup_protected(struct
> mem_cgroup *root,
> atomic_long_read(&parent->memory.children_min_usage)));
>
> WRITE_ONCE(memcg->memory.elow, effective_protection(usage, parent_usage,
> - memcg->memory.low, READ_ONCE(parent->memory.elow),
> + READ_ONCE(memcg->memory.low),
> + READ_ONCE(parent->memory.elow),
> atomic_long_read(&parent->memory.children_low_usage)));
>
> out:
> --
> 2.27.0
>
--
Michal Hocko
SUSE Labs
