[PATCH 3/8] mm: use zone lock guard in unreserve_highatomic_pageblock()

[Dmitry Ilvokhin]

Use zone_lock_irqsave lock guard in unreserve_highatomic_pageblock()
to replace the explicit lock/unlock pattern with automatic scope-based
cleanup.

Suggested-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Dmitry Ilvokhin <d@xxxxxxxxxxxx>
---
 mm/page_alloc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 260fb003822a..2857daf6ebfd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3456,7 +3456,6 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac,
 						bool force)
 {
 	struct zonelist *zonelist = ac->zonelist;
-	unsigned long flags;
 	struct zoneref *z;
 	struct zone *zone;
 	struct page *page;
@@ -3473,7 +3472,7 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac,
 					pageblock_nr_pages)
 			continue;
 
-		zone_lock_irqsave(zone, flags);
+		guard(zone_lock_irqsave)(zone);
 		for (order = 0; order < NR_PAGE_ORDERS; order++) {
 			struct free_area *area = &(zone->free_area[order]);
 			unsigned long size;
@@ -3521,11 +3520,9 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac,
 			 */
 			WARN_ON_ONCE(ret == -1);
 			if (ret > 0) {
-				zone_unlock_irqrestore(zone, flags);
 				return ret;
 			}
 		}
-		zone_unlock_irqrestore(zone, flags);
 	}
 
 	return false;
-- 
2.47.3