From fb31ba30fb10fe0ee11739f51669d581b4a1412c Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Mon, 30 Sep 2013 13:45:24 -0700 Subject: mm/hwpoison: fix the lack of one reference count against poisoned page The lack of one reference count against poisoned page for hwpoison_inject w/o hwpoison_filter enabled result in hwpoison detect -1 users still referenced the page, however, the number should be 0 except the poison handler held one after successfully unmap. This patch fix it by hold one referenced count against poisoned page for hwpoison_inject w/ and w/o hwpoison_filter enabled. Before patch: [ 71.902112] Injecting memory failure at pfn 224706 [ 71.902137] MCE 0x224706: dirty LRU page recovery: Failed [ 71.902138] MCE 0x224706: dirty LRU page still referenced by -1 users After patch: [ 94.710860] Injecting memory failure at pfn 215b68 [ 94.710885] MCE 0x215b68: dirty LRU page recovery: Recovered Reviewed-by: Naoya Horiguchi Acked-by: Andi Kleen Signed-off-by: Wanpeng Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hwpoison-inject.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index afc2daa91c6..4c84678371e 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -20,8 +20,6 @@ static int hwpoison_inject(void *data, u64 val) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (!hwpoison_filter_enable) - goto inject; if (!pfn_valid(pfn)) return -ENXIO; @@ -33,6 +31,9 @@ static int hwpoison_inject(void *data, u64 val) if (!get_page_unless_zero(hpage)) return 0; + if (!hwpoison_filter_enable) + goto inject; + if (!PageLRU(p) && !PageHuge(p)) shake_page(p, 0); /* -- cgit v1.2.3