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Subject[PATCH 2/2] hwpoison: call action_result() in failure path of hwpoison_user_mappings()
Date
hwpoison_user_mappings() could fail for various reasons, so printk()s
to print out the reasons should be done in each failure check inside
hwpoison_user_mappings().
And currently we don't call action_result() when hwpoison_user_mappings()
fails, which is not consistent with other exit points of memory error
handler. So this patch fixes these messaging problems.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
mm/memory-failure.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git mmotm-2014-07-22-15-58.orig/mm/memory-failure.c mmotm-2014-07-22-15-58/mm/memory-failure.c
index f465b98d0209..44c6bd201d3a 100644
--- mmotm-2014-07-22-15-58.orig/mm/memory-failure.c
+++ mmotm-2014-07-22-15-58/mm/memory-failure.c
@@ -911,8 +911,10 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
if (!page_mapped(hpage))
return SWAP_SUCCESS;

- if (PageKsm(p))
+ if (PageKsm(p)) {
+ pr_err("MCE %#lx: can't handle KSM pages.\n", pfn);
return SWAP_FAIL;
+ }

if (PageSwapCache(p)) {
printk(KERN_ERR
@@ -1245,7 +1247,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
*/
if (hwpoison_user_mappings(p, pfn, trapno, flags, &hpage)
!= SWAP_SUCCESS) {
- printk(KERN_ERR "MCE %#lx: cannot unmap page, give up\n", pfn);
+ action_result(pfn, "unmapping failed", IGNORED);
res = -EBUSY;
goto out;
}
--
1.9.3


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