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HWPOISON: Remove retry loop for try_to_unmap 

We don't reply in other temporary failure cases and there were no
reports of replies happening. I think the original reason it was
added was also just an early bug, not an observation of the race.

So remove the loop for now, but keep a warning message.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
hifive-unleashed-5.1
Andi Kleen 2010-09-27 23:39:30 +02:00
parent 9033ae1640
commit a08c80ebb6
1 changed files with 1 additions and 14 deletions
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15
mm/memory-failure.c
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@ -840,8 +840,6 @@ static int page_action(struct page_state *ps, struct page *p,
return (result == RECOVERED || result == DELAYED) ? 0 : -EBUSY;
}
#define N_UNMAP_TRIES 5
/*
* Do all that is necessary to remove user space mappings. Unmap
* the pages and send SIGBUS to the processes if the data was dirty.
@ -853,7 +851,6 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
struct address_space *mapping;
LIST_HEAD(tokill);
int ret;
int i;
int kill = 1;
struct page *hpage = compound_head(p);
@ -907,17 +904,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
if (kill)
collect_procs(hpage, &tokill);
/*
* try_to_unmap can fail temporarily due to races.
* Try a few times (RED-PEN better strategy?)
*/
for (i = 0; i < N_UNMAP_TRIES; i++) {
ret = try_to_unmap(hpage, ttu);
if (ret == SWAP_SUCCESS)
break;
pr_debug("MCE %#lx: try_to_unmap retry needed %d\n", pfn, ret);
}
ret = try_to_unmap(hpage, ttu);
if (ret != SWAP_SUCCESS)
printk(KERN_ERR "MCE %#lx: failed to unmap page (mapcount=%d)\n",
pfn, page_mapcount(hpage));