HWPOISON: return 0 to indicate success reliably
Return 0 to indicate success, when
- action result is RECOVERED or DELAYED
- no extra page reference
Note that dirty swapcache pages are kept in swapcache, so can have one
more reference count.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index fd1ac15..edeaf23 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -654,17 +654,21 @@
action_result(pfn, ps->msg, result);
count = page_count(p) - 1;
- if (count != 0)
+ if (ps->action == me_swapcache_dirty && result == DELAYED)
+ count--;
+ if (count != 0) {
printk(KERN_ERR
"MCE %#lx: %s page still referenced by %d users\n",
pfn, ps->msg, count);
+ result = FAILED;
+ }
/* Could do more checks here if page looks ok */
/*
* Could adjust zone counters here to correct for the missing page.
*/
- return result == RECOVERED ? 0 : -EBUSY;
+ return (result == RECOVERED || result == DELAYED) ? 0 : -EBUSY;
}
#define N_UNMAP_TRIES 5