[PATCH 4/4] mm/page_alloc: reword the comment of buddy_merge_likely()

[Wei Yang <richard.weiyang@gmail.com>]

For page with order O, we are checking its order (O + 1)'s buddy. If it
is free, we would like to put it to the tail and expect it would be
merged to a page with order (O + 2).

Reword the comment to reflect it.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
 mm/page_alloc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 594176449890..d1df7929f003 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -706,12 +706,12 @@ static inline struct page *get_page_from_free_area(struct free_area *area,
 }
 
 /*
- * If this is not the largest possible page, check if the buddy
- * of the next-highest order is free. If it is, it's possible
+ * If this is less than the 2nd largest possible page, check if the buddy
+ * of the next-higher order is free. If it is, it's possible
  * that pages are being freed that will coalesce soon. In case,
  * that is happening, add the free page to the tail of the list
  * so it's less likely to be used soon and more likely to be merged
- * as a higher order page
+ * as a 2-level higher order page
  */
 static inline bool
 buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn,
-- 
2.34.1