mm/rmap: fix obsolete comment in __page_check_anon_rmap()

Commit 21333b2b66b8 ("ksm: no debug in page_dup_rmap()") has reverted
page_dup_rmap() to an inline atomic_inc of mapcount.  So page_dup_rmap()
does not call __page_check_anon_rmap() anymore.

Link: https://lkml.kernel.org/r/20210128110209.50857-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/rmap.c b/mm/rmap.c
index 46fdbf5..c3f6e06 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1086,8 +1086,7 @@ static void __page_check_anon_rmap(struct page *page,
         * be set up correctly at this point.
         *
         * We have exclusion against page_add_anon_rmap because the caller
-        * always holds the page locked, except if called from page_dup_rmap,
-        * in which case the page is already known to be setup.
+        * always holds the page locked.
         *
         * We have exclusion against page_add_new_anon_rmap because those pages
         * are initially only visible via the pagetables, and the pte is locked