linux-kernel - [PATCH 4/4] mm,hwpoison: Drop unneeded pcplist draining

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Date:   Wed,  2 Sep 2020 11:45:10 +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>
Subject: [PATCH 4/4] 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.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 mm/madvise.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index e92e06890b08..e7cdfabd8aca 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -930,10 +930,6 @@ 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