From: Miaohe Lin <linmiaohe@huawei.com>
Date: Tue, 12 Jan 2021 23:49:24 +0000 (-0800)
Subject: mm/hugetlb: fix potential missing huge page size info
X-Git-Tag: v4.4.253~28
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf3ca4612190d330ecc8970db71d20920dc2d736;p=thirdparty%2Fkernel%2Fstable.git

mm/hugetlb: fix potential missing huge page size info

commit 0eb98f1588c2cc7a79816d84ab18a55d254f481c upstream.

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.

Link: https://lkml.kernel.org/r/20210107123449.38481-1-linmiaohe@huawei.com
Fixes: aa50d3a7aa81 ("Encode huge page size for VM_FAULT_HWPOISON errors")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 44970b17f4fe7..7a23792230854 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3659,7 +3659,7 @@ retry:
 		 * 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;
 		}