arm64: barriers: use barrier() instead of smp_mb() when !SMP

[firefly-linux-kernel-4.4.55.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index b1f57501de9c8f4f0705b30fef748c4c3f145e86..6f0c24438bbaaf6ffdaa4f840ab8da37cf9e236a 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -200,15 +200,14 @@ static void remove_migration_ptes(struct page *old, struct page *new)
  * get to the page and wait until migration is finished.
  * When we return from this function the fault will be retried.
  */
-void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
-                               unsigned long address)
+static void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
+                               spinlock_t *ptl)
 {
-       pte_t *ptep, pte;
-       spinlock_t *ptl;
+       pte_t pte;
        swp_entry_t entry;
        struct page *page;
 
-       ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
+       spin_lock(ptl);
        pte = *ptep;
        if (!is_swap_pte(pte))
                goto out;
@@ -236,6 +235,20 @@ out:
        pte_unmap_unlock(ptep, ptl);
 }
 
+void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
+                               unsigned long address)
+{
+       spinlock_t *ptl = pte_lockptr(mm, pmd);
+       pte_t *ptep = pte_offset_map(pmd, address);
+       __migration_entry_wait(mm, ptep, ptl);
+}
+
+void migration_entry_wait_huge(struct mm_struct *mm, pte_t *pte)
+{
+       spinlock_t *ptl = &(mm)->page_table_lock;
+       __migration_entry_wait(mm, pte, ptl);
+}
+
 #ifdef CONFIG_BLOCK
 /* Returns true if all buffers are successfully locked */
 static bool buffer_migrate_lock_buffers(struct buffer_head *head,