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Subject[PATCH v2 5/5] mm/hugetlb: add FOLL_MIGRATION validation before waiting for a migration entry
Date
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@linux.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
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