linux-kernel - [PATCH v5 2/2] mm/hwpoison: Add in-use hugepage hwpoison filter judgement

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Date:   Wed, 23 Feb 2022 03:22:54 -0500
From:   luofei <luofei@...cloud.com>
To:     <naoya.horiguchi@....com>, <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        luofei <luofei@...cloud.com>
Subject: [PATCH v5 2/2] mm/hwpoison: Add in-use hugepage hwpoison filter judgement

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@...cloud.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