diff options
| author | Johannes Weiner <[email protected]> | 2015-06-10 11:14:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2015-06-10 16:43:43 -0700 |
| commit | f371763a79d5212c2cb216b46fa8af46ba56cee3 (patch) | |
| tree | 05901da392e1cd5b2c837e6709c7d262a5012ae9 | |
| parent | 5129e87cb81996d4d7e8f5a86b5355c5f2d0383b (diff) | |
mm: memcontrol: fix false-positive VM_BUG_ON() on -rt
On -rt, the VM_BUG_ON(!irqs_disabled()) triggers inside the memcg
swapout path because the spin_lock_irq(&mapping->tree_lock) in the
caller doesn't actually disable the hardware interrupts - which is fine,
because on -rt the tophalves run in process context and so we are still
safe from preemption while updating the statistics.
Remove the VM_BUG_ON() but keep the comment of what we rely on.
Signed-off-by: Johannes Weiner <[email protected]>
Reported-by: Clark Williams <[email protected]>
Cc: Fernando Lopez-Lezcano <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/memcontrol.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 9da23a7ec4c0..a04225d372ba 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5835,9 +5835,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) if (!mem_cgroup_is_root(memcg)) page_counter_uncharge(&memcg->memory, 1); - /* XXX: caller holds IRQ-safe mapping->tree_lock */ - VM_BUG_ON(!irqs_disabled()); - + /* Caller disabled preemption with mapping->tree_lock */ mem_cgroup_charge_statistics(memcg, page, -1); memcg_check_events(memcg, page); } |