From: Donghai Qiao <dqiao@xxxxxxxxxx> Subject: mm/page_counter: remove an incorrect call to propagate_protected_usage() propagate_protected_usage() is called to propagate the usage change in the page_counter structure. But there is a call to this function from page_counter_try_charge() when there is actually no usage change. Hence this call should be removed. Link: https://lkml.kernel.org/r/20211118181125.3918222-1-dqiao@xxxxxxxxxx Signed-off-by: Donghai Qiao <dqiao@xxxxxxxxxx> Reviewed-by: Roman Gushchin <guro@xxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_counter.c | 1 - 1 file changed, 1 deletion(-) --- a/mm/page_counter.c~mm-page_counter-remove-an-incorrect-call-to-propagate_protected_usage +++ a/mm/page_counter.c @@ -120,7 +120,6 @@ bool page_counter_try_charge(struct page new = atomic_long_add_return(nr_pages, &c->usage); if (new > c->max) { atomic_long_sub(nr_pages, &c->usage); - propagate_protected_usage(c, new); /* * This is racy, but we can live with some * inaccuracy in the failcnt which is only used _
