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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-12-12 13:52:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 17:38:35 -0800
commit56f2fb147659e05b1e87b99791bf44b988d38545 (patch)
tree7e29f1c2cf74e4789ec5429bab3dc4f45a12ef89
parent5f24ae585be985691c017b7ab90b3669dca32d6d (diff)
mm/hugetlb.c: fix warning on freeing hwpoisoned hugepage
Fix the warning from __list_del_entry() which is triggered when a process tries to do free_huge_page() for a hwpoisoned hugepage. free_huge_page() can be called for hwpoisoned hugepage from unpoison_memory(). This function gets refcount once and clears PageHWPoison, and then puts refcount twice to return the hugepage back to free pool. The second put_page() finally reaches free_huge_page(). Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Andi Kleen <andi.kleen@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/hugetlb.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e53f39cd67db..22508ef943e6 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3172,7 +3172,13 @@ int dequeue_hwpoisoned_huge_page(struct page *hpage)
spin_lock(&hugetlb_lock);
if (is_hugepage_on_freelist(hpage)) {
- list_del(&hpage->lru);
+ /*
+ * Hwpoisoned hugepage isn't linked to activelist or freelist,
+ * but dangling hpage->lru can trigger list-debug warnings
+ * (this happens when we call unpoison_memory() on it),
+ * so let it point to itself with list_del_init().
+ */
+ list_del_init(&hpage->lru);
set_page_refcounted(hpage);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;