linux-kernel - [PATCH v3 4/5] mm,hwpoison: drop unneeded pcplist draining

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Date:   Mon, 14 Sep 2020 12:15:58 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     akpm@...ux-foundation.org
Cc:     naoya.horiguchi@....com, mhocko@...nel.org, tony.luck@...el.com,
        cai@....pw, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Oscar Salvador <osalvador@...e.de>,
        Oscar Salvador <osalvador@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH v3 4/5] mm,hwpoison: drop unneeded pcplist draining

memory_failure and soft_offline_path paths now drain pcplists by calling
get_hwpoison_page.

memory_failure flags the page as HWPoison before, so that page cannot
longer go into a pcplist, and soft_offline_page only flags a page as
HWPoison if 1) we took the page off a buddy freelist 2) the page was
in-use and we migrated it 3) was a clean pagecache.

Because of that, a page cannot longer be poisoned and be in a pcplist.

Link: https://lkml.kernel.org/r/20200908075626.11976-5-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@...e.de>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Naoya Horiguchi <naoya.horiguchi@....com>
Cc: Oscar Salvador <osalvador@...e.com>
Cc: Qian Cai <cai@....pw>
Cc: Tony Luck <tony.luck@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 mm/madvise.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 4ce66bab53dd..4bac8e85497a 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -917,10 +917,6 @@ static int madvise_inject_error(int behavior,
 			return ret;
 	}
 
-	/* Ensure that all poisoned pages are removed from per-cpu lists */
-	for_each_populated_zone(zone)
-		drain_all_pages(zone);
-
 	return 0;
 }
 #endif
-- 
2.26.2