linux-kernel - [PATCH v1 1/9] mm: hugetlb: prevent reuse of hwpoisoned free hugepages

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Date:   Thu,  1 Jun 2017 17:16:51 +0900
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: [PATCH v1 1/9] mm: hugetlb: prevent reuse of hwpoisoned free hugepages

We no longer use MIGRATE_ISOLATE to prevent reuse of hwpoison hugepages
as we did before. So current dequeue_huge_page_node() doesn't work as
intended because it still uses is_migrate_isolate_page() for this check.
This patch fixes it with PageHWPoison flag.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/hugetlb.c        | 3 +--
 mm/memory-failure.c | 1 -
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git v4.12-rc3/mm/hugetlb.c v4.12-rc3_patched/mm/hugetlb.c
index e582887..6d6c659 100644
--- v4.12-rc3/mm/hugetlb.c
+++ v4.12-rc3_patched/mm/hugetlb.c
@@ -22,7 +22,6 @@
 #include <linux/rmap.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
-#include <linux/page-isolation.h>
 #include <linux/jhash.h>
 
 #include <asm/page.h>
@@ -872,7 +871,7 @@ static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
 	struct page *page;
 
 	list_for_each_entry(page, &h->hugepage_freelists[nid], lru)
-		if (!is_migrate_isolate_page(page))
+		if (!PageHWPoison(page))
 			break;
 	/*
 	 * if 'non-isolated free hugepage' not found on the list,
diff --git v4.12-rc3/mm/memory-failure.c v4.12-rc3_patched/mm/memory-failure.c
index 2527dfed..6c1a7c9 100644
--- v4.12-rc3/mm/memory-failure.c
+++ v4.12-rc3_patched/mm/memory-failure.c
@@ -49,7 +49,6 @@
 #include <linux/swap.h>
 #include <linux/backing-dev.h>
 #include <linux/migrate.h>
-#include <linux/page-isolation.h>
 #include <linux/suspend.h>
 #include <linux/slab.h>
 #include <linux/swapops.h>
-- 
2.7.0