* [PATCH v5 2/2] mm/hwpoison: Add in-use hugepage hwpoison filter judgement
@ 2022-02-23 8:22 luofei
0 siblings, 0 replies; only message in thread
From: luofei @ 2022-02-23 8:22 UTC (permalink / raw)
To: naoya.horiguchi, akpm; +Cc: linux-mm, linux-kernel, luofei
After successfully obtaining the reference count of the huge
page, it is still necessary to call hwpoison_filter() to make a
filter judgement, otherwise the filter hugepage will be unmaped
and the related process may be killed.
Signed-off-by: luofei <luofei@unicloud.com>
---
mm/memory-failure.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 7e16d31df0f3..bad659092176 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1547,6 +1547,14 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
lock_page(head);
page_flags = head->flags;
+ if (hwpoison_filter(p)) {
+ if (TestClearPageHWPoison(head))
+ num_poisoned_pages_dec();
+ put_page(p);
+ res = -EOPNOTSUPP;
+ goto out;
+ }
+
/*
* TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
* simply disable it. In order to make it work properly, we need
--
2.27.0
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