If try_to_unmap() fails, the hwpoisoned page still resides in the address
space of some processes. We should kill these processes or the hwpoisoned
page might be consumed later. collect_procs() is always called to collect
relevant processes now so they can be killed later if unmap fails.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/memory-failure.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a2f4e8b00a26..5f9615a86296 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1396,7 +1396,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
struct address_space *mapping;
LIST_HEAD(tokill);
bool unmap_success;
- int kill = 1, forcekill;
+ int forcekill;
bool mlocked = PageMlocked(hpage);
/*
@@ -1437,7 +1437,6 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
if (page_mkclean(hpage)) {
SetPageDirty(hpage);
} else {
- kill = 0;
ttu |= TTU_IGNORE_HWPOISON;
pr_info("%#lx: corrupted page was clean: dropped without side effects\n",
pfn);
@@ -1452,8 +1451,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
* Error handling: We ignore errors here because
* there's nothing that can be done.
*/
- if (kill)
- collect_procs(hpage, &tokill, flags & MF_ACTION_REQUIRED);
+ collect_procs(hpage, &tokill, flags & MF_ACTION_REQUIRED);
if (PageHuge(hpage) && !PageAnon(hpage)) {
/*
@@ -1495,7 +1493,8 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
* use a more force-full uncatchable kill to prevent
* any accesses to the poisoned memory.
*/
- forcekill = PageDirty(hpage) || (flags & MF_MUST_KILL);
+ forcekill = PageDirty(hpage) || (flags & MF_MUST_KILL) ||
+ !unmap_success;
kill_procs(&tokill, forcekill, !unmap_success, pfn, flags);
return unmap_success;
--
2.23.0
