1 files changed, 20 insertions, 0 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 1c2a71aa05cd..0576c0535988 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -976,3 +976,23 @@ out2:
 }
 #endif
 
+/*
+ * Call migration functions in the vma_ops that may prepare
+ * memory in a vm for migration. migration functions may perform
+ * the migration for vmas that do not have an underlying page struct.
+ */
+int migrate_vmas(struct mm_struct *mm, const nodemask_t *to,
+        const nodemask_t *from, unsigned long flags)
+{
+        struct vm_area_struct *vma;
+        int err = 0;
+
+        for(vma = mm->mmap; vma->vm_next && !err; vma = vma->vm_next) {
+                if (vma->vm_ops && vma->vm_ops->migrate) {
+                        err = vma->vm_ops->migrate(vma, to, from, flags);
+                        if (err)
+                                break;
+                }
+        }
+        return err;
+}