diff options
| author | Wanpeng Li <liwanp@linux.vnet.ibm.com> | 2013-09-30 13:45:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-30 14:31:03 -0700 |
| commit | fb31ba30fb10fe0ee11739f51669d581b4a1412c (patch) | |
| tree | fd725fcd501f855706c253be37b0c2e2602586a1 /mm/hwpoison-inject.c | |
| parent | 2d421acd1568cf2d83739a1afec8e18edb9e3d16 (diff) | |
| download | lwn-fb31ba30fb10fe0ee11739f51669d581b4a1412c.tar.gz lwn-fb31ba30fb10fe0ee11739f51669d581b4a1412c.zip | |
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 <n-horiguchi@ah.jp.nec.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hwpoison-inject.c')
| -rw-r--r-- | mm/hwpoison-inject.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index afc2daa91c60..4c84678371eb 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); /* |