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mm: workingset: replace IRQ-off check with a lockdep assert. 

Commit 68d48e6a2d ("mm: workingset: add vmstat counter for shadow
nodes") introduced an IRQ-off check to ensure that a lock is held which
also disabled interrupts.  This does not work the same way on PREEMPT_RT
because none of the locks, that are held, disable interrupts.

Replace this check with a lockdep assert which ensures that the lock is
held.

Link: https://lkml.kernel.org/r/20220301122143.1521823-3-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zefan Li <lizefan.x@bytedance.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sebastian Andrzej Siewior 2022-03-22 14:45:50 -07:00 committed by Linus Torvalds
parent ff042f4a9b
commit 2386eef214
1 changed files with 4 additions and 1 deletions
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5
mm/workingset.c
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@ -433,6 +433,8 @@ struct list_lru shadow_nodes;
void workingset_update_node(struct xa_node *node)
{
struct address_space *mapping;
/*
* Track non-empty nodes that contain only shadow entries;
* unlink those that contain pages or are being freed.
@ -441,7 +443,8 @@ void workingset_update_node(struct xa_node *node)
* already where they should be. The list_empty() test is safe
* as node->private_list is protected by the i_pages lock.
*/
VM_WARN_ON_ONCE(!irqs_disabled()); /* For __inc_lruvec_page_state */
mapping = container_of(node->array, struct address_space, i_pages);
lockdep_assert_held(&mapping->i_pages.xa_lock);
if (node->count && node->count == node->nr_values) {
if (list_empty(&node->private_list)) {