linux-kernel - [PATCH v2 5/5] mm/hugetlb: add FOLL_MIGRATION validation before waiting for a migration entry

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Message-Id: <2aa2856012baa9f7251c993ee0f1406a51185a83.1661240170.git.baolin.wang@linux.alibaba.com>
Date:   Tue, 23 Aug 2022 15:50:05 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        mike.kravetz@...cle.com
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] mm/hugetlb: add FOLL_MIGRATION validation before waiting for a migration entry

The hugetlb should keep the same logics with normal page when waiting
for a migration pte entry, that means we should also validate if
the FOLL_MIGRATION flag is set before waiting for a migration pte entry
of a hugetlb page.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/hugetlb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2c4048a..6430b74 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -7075,6 +7075,11 @@ struct page * __weak
 			goto out;
 		}
 	} else {
+		if (!(flags & FOLL_MIGRATION)) {
+			page = NULL;
+			goto out;
+		}
+
 		if (is_hugetlb_entry_migration(pte)) {
 			spin_unlock(ptl);
 			__migration_entry_wait_huge((pte_t *)pmd, ptl);
@@ -7113,6 +7118,11 @@ struct page * __weak
 			goto out;
 		}
 	} else {
+		if (!(flags & FOLL_MIGRATION)) {
+			page = NULL;
+			goto out;
+		}
+
 		if (is_hugetlb_entry_migration(pte)) {
 			spin_unlock(ptl);
 			__migration_entry_wait(mm, (pte_t *)pud, ptl);
-- 
1.8.3.1