linux-kernel - [PATCH] mm/hugetlb: Fix potential missing huge page size info

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Message-ID: <20210107123449.38481-1-linmiaohe@huawei.com>
Date:   Thu, 7 Jan 2021 07:34:49 -0500
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm/hugetlb: Fix potential missing huge page size info

The huge page size is encoded for VM_FAULT_HWPOISON errors only. So if we
return VM_FAULT_HWPOISON, huge page size would just be ignored.

Fixes: aa50d3a7aa81 ("Encode huge page size for VM_FAULT_HWPOISON errors")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Cc: <stable@...r.kernel.org>
---
 mm/hugetlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3ada2e78316c..e249bffa0e75 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4371,7 +4371,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 		 * So we need to block hugepage fault by PG_hwpoison bit check.
 		 */
 		if (unlikely(PageHWPoison(page))) {
-			ret = VM_FAULT_HWPOISON |
+			ret = VM_FAULT_HWPOISON_LARGE |
 				VM_FAULT_SET_HINDEX(hstate_index(h));
 			goto backout_unlocked;
 		}
-- 
2.19.1