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-rw-r--r--mm/mempolicy.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c53f8beeb507..ec2eaceffd74 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -718,6 +718,14 @@ static const struct mm_walk_ops queue_pages_walk_ops = {
.hugetlb_entry = queue_folios_hugetlb,
.pmd_entry = queue_folios_pte_range,
.test_walk = queue_pages_test_walk,
+ .walk_lock = PGWALK_RDLOCK,
+};
+
+static const struct mm_walk_ops queue_pages_lock_vma_walk_ops = {
+ .hugetlb_entry = queue_folios_hugetlb,
+ .pmd_entry = queue_folios_pte_range,
+ .test_walk = queue_pages_test_walk,
+ .walk_lock = PGWALK_WRLOCK,
};
/*
@@ -738,7 +746,7 @@ static const struct mm_walk_ops queue_pages_walk_ops = {
static int
queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
nodemask_t *nodes, unsigned long flags,
- struct list_head *pagelist)
+ struct list_head *pagelist, bool lock_vma)
{
int err;
struct queue_pages qp = {
@@ -749,8 +757,10 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.end = end,
.first = NULL,
};
+ const struct mm_walk_ops *ops = lock_vma ?
+ &queue_pages_lock_vma_walk_ops : &queue_pages_walk_ops;
- err = walk_page_range(mm, start, end, &queue_pages_walk_ops, &qp);
+ err = walk_page_range(mm, start, end, ops, &qp);
if (!qp.first)
/* whole range in hole */
@@ -1078,7 +1088,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
vma = find_vma(mm, 0);
VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)));
queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask,
- flags | MPOL_MF_DISCONTIG_OK, &pagelist);
+ flags | MPOL_MF_DISCONTIG_OK, &pagelist, false);
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, alloc_migration_target, NULL,
@@ -1321,12 +1331,8 @@ static long do_mbind(unsigned long start, unsigned long len,
* Lock the VMAs before scanning for pages to migrate, to ensure we don't
* miss a concurrently inserted page.
*/
- vma_iter_init(&vmi, mm, start);
- for_each_vma_range(vmi, vma, end)
- vma_start_write(vma);
-
ret = queue_pages_range(mm, start, end, nmask,
- flags | MPOL_MF_INVERT, &pagelist);
+ flags | MPOL_MF_INVERT, &pagelist, true);
if (ret < 0) {
err = ret;