From: Andrea Arcangeli <aarcange@redhat.com>
Date: Thu, 13 Jan 2011 23:46:38 +0000 (-0800)
Subject: thp: comment reminder in destroy_compound_page
X-Git-Tag: firefly_0821_release~7613^2~2804
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=59ff421631295cd54dbf75dcc53d27e84af6d9c0;p=firefly-linux-kernel-4.4.55.git

thp: comment reminder in destroy_compound_page

Warn destroy_compound_page that __split_huge_page_refcount is heavily
dependent on its internal behavior.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8be81422d4bd..6e62d5f9d40b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -357,6 +357,7 @@ void prep_compound_page(struct page *page, unsigned long order)
 	}
 }
 
+/* update __split_huge_page_refcount if you change this function */
 static int destroy_compound_page(struct page *page, unsigned long order)
 {
 	int i;