[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1595681998-19193-8-git-send-email-alex.shi@linux.alibaba.com>
Date: Sat, 25 Jul 2020 20:59:44 +0800
From: Alex Shi <alex.shi@...ux.alibaba.com>
To: akpm@...ux-foundation.org, mgorman@...hsingularity.net,
tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
daniel.m.jordan@...cle.com, yang.shi@...ux.alibaba.com,
willy@...radead.org, hannes@...xchg.org, lkp@...el.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org, shakeelb@...gle.com,
iamjoonsoo.kim@....com, richard.weiyang@...il.com,
kirill@...temov.name, alexander.duyck@...il.com,
rong.a.chen@...el.com
Subject: [PATCH v17 07/21] mm/thp: remove code path which never got into
split_huge_page() will never call on a page which isn't on lru list, so
this code never got a chance to run, and should not be run, to add tail
pages on a lru list which head page isn't there.
Although the bug was never triggered, it'better be removed for code
correctness.
BTW, it looks better to have a WARN() set in the wrong path, but the
path will be changed in incoming new page isolation func. So just save
it now.
Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
mm/huge_memory.c | 10 ----------
1 file changed, 10 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b18f21da4dac..1fb4147ff854 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2357,16 +2357,6 @@ static void lru_add_page_tail(struct page *head, struct page *page_tail,
/* page reclaim is reclaiming a huge page */
get_page(page_tail);
list_add_tail(&page_tail->lru, list);
- } else {
- /*
- * Head page has not yet been counted, as an hpage,
- * so we must account for each subpage individually.
- *
- * Put page_tail on the list at the correct position
- * so they all end up in order.
- */
- add_page_to_lru_list_tail(page_tail, lruvec,
- page_lru(page_tail));
}
}
--
1.8.3.1
Powered by blists - more mailing lists