diff options
| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2012-12-13 01:52:33 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-13 05:38:35 +0400 |
| commit | 56f2fb147659e05b1e87b99791bf44b988d38545 (patch) | |
| tree | 7e29f1c2cf74e4789ec5429bab3dc4f45a12ef89 | |
| parent | 5f24ae585be985691c017b7ab90b3669dca32d6d (diff) | |
| download | linux-56f2fb147659e05b1e87b99791bf44b988d38545.tar.xz | |
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.c | 8 |
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]--; |