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HWPOISON: make semantics of IGNORED/DELAYED clear

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Change semantics for
- IGNORED: not handled; it may well be _unsafe_
- DELAYED: to be handled later; it is _safe_

With this change,
- IGNORED/FAILED mean (maybe) Error
- DELAYED/RECOVERED mean Success

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 847ce401df
commit d95ea51e3a
1 changed files with 7 additions and 15 deletions
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22
mm/memory-failure.c
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@ -336,16 +336,16 @@ static void collect_procs(struct page *page, struct list_head *tokill)
*/
enum outcome {
FAILED, /* Error handling failed */
IGNORED, /* Error: cannot be handled */
FAILED, /* Error: handling failed */
DELAYED, /* Will be handled later */
IGNORED, /* Error safely ignored */
RECOVERED, /* Successfully recovered */
};
static const char *action_name[] = {
[IGNORED] = "Ignored",
[FAILED] = "Failed",
[DELAYED] = "Delayed",
[IGNORED] = "Ignored",
[RECOVERED] = "Recovered",
};
@ -379,14 +379,6 @@ static int delete_from_lru_cache(struct page *p)
* could be more sophisticated.
*/
static int me_kernel(struct page *p, unsigned long pfn)
{
return DELAYED;
}
/*
* Already poisoned page.
*/
static int me_ignore(struct page *p, unsigned long pfn)
{
return IGNORED;
}
@ -604,7 +596,7 @@ static struct page_state {
char *msg;
int (*action)(struct page *p, unsigned long pfn);
} error_states[] = {
{ reserved, reserved, "reserved kernel", me_ignore },
{ reserved, reserved, "reserved kernel", me_kernel },
/*
* free pages are specially detected outside this table:
* PG_buddy pages only make a small fraction of all free pages.
@ -788,7 +780,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
p = pfn_to_page(pfn);
if (TestSetPageHWPoison(p)) {
action_result(pfn, "already hardware poisoned", IGNORED);
printk(KERN_ERR "MCE %#lx: already hardware poisoned\n", pfn);
return 0;
}
@ -843,7 +835,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
* unpoison always clear PG_hwpoison inside page lock
*/
if (!PageHWPoison(p)) {
action_result(pfn, "unpoisoned", IGNORED);
printk(KERN_ERR "MCE %#lx: just unpoisoned\n", pfn);
res = 0;
goto out;
}
@ -865,7 +857,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
*/
if (PageLRU(p) && !PageSwapCache(p) && p->mapping == NULL) {
action_result(pfn, "already truncated LRU", IGNORED);
res = 0;
res = -EBUSY;
goto out;
}