[PATCH] mm/mlock: Fix WARN_ON_ONCE condition.

[Liu Ye]

The condition in WARN_ON_ONCE(cpu_online(cpu)) should be !cpu_online(cpu)
to ensure the warning is triggered when the CPU is offline.

Signed-off-by: Liu Ye <liuye@xxxxxxxxxx>
---
 mm/mlock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mlock.c b/mm/mlock.c
index cde076fa7d5e..40acf7897917 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -224,7 +224,7 @@ void mlock_drain_remote(int cpu)
 {
 	struct folio_batch *fbatch;
 
-	WARN_ON_ONCE(cpu_online(cpu));
+	WARN_ON_ONCE(!cpu_online(cpu));
 	fbatch = &per_cpu(mlock_fbatch.fbatch, cpu);
 	if (folio_batch_count(fbatch))
 		mlock_folio_batch(fbatch);
-- 
2.25.1