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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>
This commit is contained in:
Wu Fengguang 2009-12-16 12:19:58 +01:00 committed by Andi Kleen
parent d95ea51e3a
commit 138ce286eb
1 changed files with 6 additions and 2 deletions
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8
mm/memory-failure.c
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@ -654,17 +654,21 @@ static int page_action(struct page_state *ps, struct page *p,
action_result(pfn, ps->msg, result); action_result(pfn, ps->msg, result);
count = page_count(p) - 1; count = page_count(p) - 1;
if (count != 0) if (ps->action == me_swapcache_dirty && result == DELAYED)
count--;
if (count != 0) {
printk(KERN_ERR printk(KERN_ERR
"MCE %#lx: %s page still referenced by %d users\n", "MCE %#lx: %s page still referenced by %d users\n",
pfn, ps->msg, count); pfn, ps->msg, count);
result = FAILED;
}
/* Could do more checks here if page looks ok */ /* Could do more checks here if page looks ok */
/* /*
* Could adjust zone counters here to correct for the missing page. * 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 #define N_UNMAP_TRIES 5