[PATCH] mm/page_alloc: update comments for rmqueue()

[cgel . zte]

From: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>

Since commit 44042b449872 ("mm/page_alloc: allow high-order pages to be
stored on the per-cpu lists"), the per-cpu page allocators (PCP) is not
only for order-0 pages. Update the comments.

Signed-off-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5486d47406e..bed7570e0746 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3815,7 +3815,8 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
 }
 
 /*
- * Allocate a page from the given zone. Use pcplists for order-0 allocations.
+ * Allocate a page from the given zone.
+ * Use pcplists for THP or "cheap" high-order allocations.
  */
 static inline
 struct page *rmqueue(struct zone *preferred_zone,
-- 
2.15.2