Vladimir notes: > > + local_irq_disable(); > > + mem_cgroup_charge_statistics(memcg, page, -1); > > + memcg_check_events(memcg, page); > > + local_irq_enable(); > > AFAICT mem_cgroup_swapout() is called under mapping->tree_lock with irqs > disabled, so we should use irq_save/restore here. Simply remove the irq-disabling altogether and rely on the caller holding the mapping->tree_lock for now. Reported-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> --- mm/memcontrol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) For "mm: memcontrol: uncharge pages on swapout" in -mm. diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ae9b630e928b..09fece0eb9f1 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5777,10 +5777,11 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) if (!mem_cgroup_is_root(memcg)) page_counter_uncharge(&memcg->memory, 1); - local_irq_disable(); + /* XXX: caller holds IRQ-safe mapping->tree_lock */ + VM_BUG_ON(!irqs_disabled()); + mem_cgroup_charge_statistics(memcg, page, -1); memcg_check_events(memcg, page); - local_irq_enable(); } /** -- 2.1.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>