[PATCH v2 2/8] mm: use zone lock guard in unset_migratetype_isolate()

[Dmitry Ilvokhin]

Use spinlock_irqsave zone lock guard in unset_migratetype_isolate() to
replace the explicit lock/unlock and goto pattern with automatic
scope-based cleanup.

Suggested-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Dmitry Ilvokhin <d@xxxxxxxxxxxx>
---
 mm/page_isolation.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index c48ff5c00244..9d606052dd80 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -223,15 +223,14 @@ static int set_migratetype_isolate(struct page *page, enum pb_isolate_mode mode,
 static void unset_migratetype_isolate(struct page *page)
 {
 	struct zone *zone;
-	unsigned long flags;
 	bool isolated_page = false;
 	unsigned int order;
 	struct page *buddy;
 
 	zone = page_zone(page);
-	spin_lock_irqsave(&zone->lock, flags);
+	guard(spinlock_irqsave)(&zone->lock);
 	if (!is_migrate_isolate_page(page))
-		goto out;
+		return;
 
 	/*
 	 * Because freepage with more than pageblock_order on isolated
@@ -279,8 +278,6 @@ static void unset_migratetype_isolate(struct page *page)
 		__putback_isolated_page(page, order, get_pageblock_migratetype(page));
 	}
 	zone->nr_isolate_pageblock--;
-out:
-	spin_unlock_irqrestore(&zone->lock, flags);
 }
 
 static inline struct page *
-- 
2.52.0