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Date:   Fri, 14 Feb 2020 20:47:16 +0000
From:   Jules Irenge <>
Cc:, Jules Irenge <>,
        Andrew Morton <>, (open list:MEMORY MANAGEMENT)
Subject: [PATCH 05/30] mm/compaction: Add missing annotation for compact_lock_irqsave

Sparse reports a warning at compact_lock_irqsave()

warning: context imbalance in compact_lock_irqsave() - wrong count at exit

The root cause is the missing annotation at compact_lock_irqsave()
Add the missing __acquires(lock) annotation.

Signed-off-by: Jules Irenge <>
 mm/compaction.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index 672d3c78c6ab..81190fe22200 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -481,6 +481,7 @@ static bool test_and_set_skip(struct compact_control *cc, struct page *page,
 static bool compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
 						struct compact_control *cc)
+	__acquires(lock)
 	/* Track if the lock is contended in async mode */
 	if (cc->mode == MIGRATE_ASYNC && !cc->contended) {

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