Merge branch 'core/locking' into core/urgent

1 files changed, 13 insertions, 7 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 971d0eda754..339cf5c4d5d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2273,14 +2273,14 @@ int install_special_mapping(struct mm_struct *mm,
 
 static DEFINE_MUTEX(mm_all_locks_mutex);
 
-static void vm_lock_anon_vma(struct anon_vma *anon_vma)
+static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
 {
         if (!test_bit(0, (unsigned long *) &anon_vma->head.next)) {
                 /*
                  * The LSB of head.next can't change from under us
                  * because we hold the mm_all_locks_mutex.
                  */
-                spin_lock(&anon_vma->lock);
+                spin_lock_nest_lock(&anon_vma->lock, &mm->mmap_sem);
                 /*
                  * We can safely modify head.next after taking the
                  * anon_vma->lock. If some other vma in this mm shares
@@ -2296,7 +2296,7 @@ static void vm_lock_anon_vma(struct anon_vma *anon_vma)
         }
 }
 
-static void vm_lock_mapping(struct address_space *mapping)
+static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
 {
         if (!test_bit(AS_MM_ALL_LOCKS, &mapping->flags)) {
                 /*
@@ -2310,7 +2310,7 @@ static void vm_lock_mapping(struct address_space *mapping)
                  */
                 if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
                         BUG();
-                spin_lock(&mapping->i_mmap_lock);
+                spin_lock_nest_lock(&mapping->i_mmap_lock, &mm->mmap_sem);
         }
 }
 
@@ -2358,11 +2358,17 @@ int mm_take_all_locks(struct mm_struct *mm)
         for (vma = mm->mmap; vma; vma = vma->vm_next) {
                 if (signal_pending(current))
                         goto out_unlock;
-                if (vma->anon_vma)
-                        vm_lock_anon_vma(vma->anon_vma);
                 if (vma->vm_file && vma->vm_file->f_mapping)
-                        vm_lock_mapping(vma->vm_file->f_mapping);
+                        vm_lock_mapping(mm, vma->vm_file->f_mapping);
+        }
+
+        for (vma = mm->mmap; vma; vma = vma->vm_next) {
+                if (signal_pending(current))
+                        goto out_unlock;
+                if (vma->anon_vma)
+                        vm_lock_anon_vma(mm, vma->anon_vma);
         }
+
         ret = 0;
 
 out_unlock: