[PATCH 1/3] HWPOISON, hugetlbfs: fix warning on freeing hwpoisoned hugepage

[Naoya Horiguchi]

This patch fixes the warning from __list_del_entry() which is triggered
when a process tries to do free_huge_page() for a hwpoisoned hugepage.

Originally, page->lru of hugetlbfs head page was dangling when the
hugepage was in use. This behavior has changed by commit 0edaecfab218d7
("hugetlb: add a list for tracking in-use HugeTLB pages"), where hugepages
in use are linked to hugepage_activelist. HWpoisoned hugepages should not
be charged to any process, so we introduce another list to link hwpoisoned
hugepages.

Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
 include/linux/hugetlb.h | 3 +++
 mm/hugetlb.c            | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git v3.7-rc8.orig/include/linux/hugetlb.h v3.7-rc8/include/linux/hugetlb.h
index 2251648..13858ba 100644
--- v3.7-rc8.orig/include/linux/hugetlb.h
+++ v3.7-rc8/include/linux/hugetlb.h
@@ -230,6 +230,9 @@ struct hstate {
 	unsigned long nr_overcommit_huge_pages;
 	struct list_head hugepage_activelist;
 	struct list_head hugepage_freelists[MAX_NUMNODES];
+#ifdef CONFIG_MEMORY_FAILURE
+	struct list_head hugepage_hwpoisonedlist;
+#endif
 	unsigned int nr_huge_pages_node[MAX_NUMNODES];
 	unsigned int free_huge_pages_node[MAX_NUMNODES];
 	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
diff --git v3.7-rc8.orig/mm/hugetlb.c v3.7-rc8/mm/hugetlb.c
index 59a0059..e61a749 100644
--- v3.7-rc8.orig/mm/hugetlb.c
+++ v3.7-rc8/mm/hugetlb.c
@@ -1939,6 +1939,7 @@ void __init hugetlb_add_hstate(unsigned order)
 	for (i = 0; i < MAX_NUMNODES; ++i)
 		INIT_LIST_HEAD(&h->hugepage_freelists[i]);
 	INIT_LIST_HEAD(&h->hugepage_activelist);
+	INIT_LIST_HEAD(&h->hugepage_hwpoisonedlist);
 	h->next_nid_to_alloc = first_node(node_states[N_HIGH_MEMORY]);
 	h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
 	snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
@@ -3170,7 +3171,7 @@ int dequeue_hwpoisoned_huge_page(struct page *hpage)
 
 	spin_lock(&hugetlb_lock);
 	if (is_hugepage_on_freelist(hpage)) {
-		list_del(&hpage->lru);
+		list_move(&hpage->lru, &h->hugepage_hwpoisonedlist);
 		set_page_refcounted(hpage);
 		h->free_huge_pages--;
 		h->free_huge_pages_node[nid]--;
-- 
1.7.11.7

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