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Diffstat (limited to 'mm/page_counter.c')
-rw-r--r--mm/page_counter.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/mm/page_counter.c b/mm/page_counter.c
index 8a0cc24b60dd..db20d6452b71 100644
--- a/mm/page_counter.c
+++ b/mm/page_counter.c
@@ -17,24 +17,23 @@ static void propagate_protected_usage(struct page_counter *c,
unsigned long usage)
{
unsigned long protected, old_protected;
- unsigned long low, min;
long delta;
if (!c->parent)
return;
- min = READ_ONCE(c->min);
- if (min || atomic_long_read(&c->min_usage)) {
- protected = min(usage, min);
+ protected = min(usage, READ_ONCE(c->min));
+ old_protected = atomic_long_read(&c->min_usage);
+ if (protected != old_protected) {
old_protected = atomic_long_xchg(&c->min_usage, protected);
delta = protected - old_protected;
if (delta)
atomic_long_add(delta, &c->parent->children_min_usage);
}
- low = READ_ONCE(c->low);
- if (low || atomic_long_read(&c->low_usage)) {
- protected = min(usage, low);
+ protected = min(usage, READ_ONCE(c->low));
+ old_protected = atomic_long_read(&c->low_usage);
+ if (protected != old_protected) {
old_protected = atomic_long_xchg(&c->low_usage, protected);
delta = protected - old_protected;
if (delta)