mm: update the comment in __isolate_free_page

We need to assure the comment is consistent with the code.

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/1466171914-21027-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
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 452513bf02ceca4d331a2bd1781d0e1f9ec47b79..b6d38b1c1cdb47b629ca4b449823c643ca4e4bd1 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2517,7 +2517,10 @@ int __isolate_free_page(struct page *page, unsigned int order)
        zone->free_area[order].nr_free--;
        rmv_page_order(page);
 
-       /* Set the pageblock if the isolated page is at least a pageblock */
+       /*
+        * Set the pageblock if the isolated page is at least half of a
+        * pageblock
+        */
        if (order >= pageblock_order - 1) {
                struct page *endpage = page + (1 << order) - 1;
                for (; page < endpage; page += pageblock_nr_pages) {