Why is this applied to 5.4? $ git describe-ver 1a3e1f40962c v5.9-rc1~97^2~97
I do not see 1a3e1f40962c in 5.4 stable tree. What am I missing?
On Tue 27-02-24 14:12:00, Greg KH wrote: [...]
Fixes: 1a3e1f40962c ("mm: memcontrol: decouple reference counting from page accounting") Reported-by: syzbot+b305848212deec86eabe@syzkaller.appspotmail.com Reported-by: syzbot+b5ea6fb6f139c8b9482b@syzkaller.appspotmail.com Signed-off-by: Michal Hocko mhocko@suse.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Reviewed-by: Shakeel Butt shakeelb@google.com Acked-by: Johannes Weiner hannes@cmpxchg.org Cc: Roman Gushchin guro@fb.com Cc: Hugh Dickins hughd@google.com Link: https://lkml.kernel.org/r/20200820090341.GC5033@dhcp22.suse.cz Signed-off-by: Linus Torvalds torvalds@linux-foundation.org
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b807952b4d43..cfa6cbad21d5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6774,6 +6774,9 @@ static void uncharge_batch(const struct uncharge_gather *ug) __this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_pages); memcg_check_events(ug->memcg, ug->dummy_page); local_irq_restore(flags);
- /* drop reference from uncharge_page */
- css_put(&ug->memcg->css);
} static void uncharge_page(struct page *page, struct uncharge_gather *ug) @@ -6797,6 +6800,9 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug) uncharge_gather_clear(ug); } ug->memcg = page->mem_cgroup;
/* pairs with css_put in uncharge_batch */css_get(&ug->memcg->css);nr_pages = compound_nr(page);