mm: Convert i_mmap_lock to a mutex

Straightforward conversion of i_mmap_lock to a mutex.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Miller <davem@davemloft.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Tony Luck <tony.luck@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

17 files changed, 58 insertions, 58 deletions

diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt
index 65f4c795015d..9c0a80d17a23 100644
--- a/Documentation/lockstat.txt
+++ b/Documentation/lockstat.txt
@@ -136,7 +136,7 @@ View the top contending locks:
                              dcache_lock:          1037           1161           0.38          45.32         774.51           6611         243371           0.15         306.48       77387.24
                          &inode->i_mutex:           161            286 18446744073709       62882.54     1244614.55           3653          20598 18446744073709       62318.60     1693822.74
                          &zone->lru_lock:            94             94           0.53           7.33          92.10           4366          32690           0.29          59.81       16350.06
-              &inode->i_data.i_mmap_lock:            79             79           0.40           3.77          53.03          11779          87755           0.28         116.93       29898.44
+              &inode->i_data.i_mmap_mutex:            79             79           0.40           3.77          53.03          11779          87755           0.28         116.93       29898.44
                         &q->__queue_lock:            48             50           0.52          31.62          86.31            774          13131           0.17         113.08       12277.52
                         &rq->rq_lock_key:            43             47           0.74          68.50         170.63           3706          33929           0.22         107.99       17460.62
                       &rq->rq_lock_key#2:            39             46           0.75           6.68          49.03           2979          32292           0.17         125.17       17137.63
diff --git a/Documentation/vm/locking b/Documentation/vm/locking
index 25fadb448760..f61228bd6395 100644
--- a/Documentation/vm/locking
+++ b/Documentation/vm/locking
@@ -66,7 +66,7 @@ in some cases it is not really needed. Eg, vm_start is modified by
 expand_stack(), it is hard to come up with a destructive scenario without 
 having the vmlist protection in this case.
 
-The page_table_lock nests with the inode i_mmap_lock and the kmem cache
+The page_table_lock nests with the inode i_mmap_mutex and the kmem cache
 c_spinlock spinlocks.  This is okay, since the kmem code asks for pages after
 dropping c_spinlock.  The page_table_lock also nests with pagecache_lock and
 pagemap_lru_lock spinlocks, and no code asks for memory with these locks
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index d4203988504a..f581a18c0d4d 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -72,7 +72,7 @@ static void huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
         if (!vma_shareable(vma, addr))
                 return;
 
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(svma, &iter, &mapping->i_mmap, idx, idx) {
                 if (svma == vma)
                         continue;
@@ -97,7 +97,7 @@ static void huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
                 put_page(virt_to_page(spte));
         spin_unlock(&mm->page_table_lock);
 out:
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
 }
 
 /*
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index b9eeb1cd03ff..e7a035781b7d 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -412,10 +412,10 @@ static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
         pgoff = offset >> PAGE_SHIFT;
 
         i_size_write(inode, offset);
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         if (!prio_tree_empty(&mapping->i_mmap))
                 hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         truncate_hugepages(inode, offset);
         return 0;
 }
diff --git a/fs/inode.c b/fs/inode.c
index 7a7284c71abd..88aa3bcc7681 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -326,7 +326,7 @@ void address_space_init_once(struct address_space *mapping)
         memset(mapping, 0, sizeof(*mapping));
         INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
         spin_lock_init(&mapping->tree_lock);
-        spin_lock_init(&mapping->i_mmap_lock);
+        mutex_init(&mapping->i_mmap_mutex);
         INIT_LIST_HEAD(&mapping->private_list);
         spin_lock_init(&mapping->private_lock);
         INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5d2c86bdf5ba..5bb9e826019b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -634,7 +634,7 @@ struct address_space {
         unsigned int            i_mmap_writable;/* count VM_SHARED mappings */
         struct prio_tree_root   i_mmap;         /* tree of private and shared mappings */
         struct list_head        i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
-        spinlock_t              i_mmap_lock;    /* protect tree, count, list */
+        struct mutex            i_mmap_mutex;   /* protect tree, count, list */
         unsigned long           nrpages;        /* number of total pages */
         pgoff_t                 writeback_index;/* writeback starts here */
         const struct address_space_operations *a_ops;   /* methods */
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index cc2e7dfea9d7..a877dfc243eb 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -150,7 +150,7 @@ struct mmu_notifier_ops {
  * Therefore notifier chains can only be traversed when either
  *
  * 1. mmap_sem is held.
- * 2. One of the reverse map locks is held (i_mmap_lock or anon_vma->lock).
+ * 2. One of the reverse map locks is held (i_mmap_mutex or anon_vma->lock).
  * 3. No other concurrent thread can access the list (release)
  */
 struct mmu_notifier {
diff --git a/kernel/fork.c b/kernel/fork.c
index 4eef925477fc..927692734bcf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -383,14 +383,14 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                         get_file(file);
                         if (tmp->vm_flags & VM_DENYWRITE)
                                 atomic_dec(&inode->i_writecount);
-                        spin_lock(&mapping->i_mmap_lock);
+                        mutex_lock(&mapping->i_mmap_mutex);
                         if (tmp->vm_flags & VM_SHARED)
                                 mapping->i_mmap_writable++;
                         flush_dcache_mmap_lock(mapping);
                         /* insert tmp into the share list, just after mpnt */
                         vma_prio_tree_add(tmp, mpnt);
                         flush_dcache_mmap_unlock(mapping);
-                        spin_unlock(&mapping->i_mmap_lock);
+                        mutex_unlock(&mapping->i_mmap_mutex);
                 }
 
                 /*
diff --git a/mm/filemap.c b/mm/filemap.c
index 8144f87dcbb4..88354ae0b1fd 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -58,16 +58,16 @@
 /*
  * Lock ordering:
  *
- *  ->i_mmap_lock               (truncate_pagecache)
+ *  ->i_mmap_mutex              (truncate_pagecache)
  *    ->private_lock            (__free_pte->__set_page_dirty_buffers)
  *      ->swap_lock             (exclusive_swap_page, others)
  *        ->mapping->tree_lock
  *
  *  ->i_mutex
- *    ->i_mmap_lock             (truncate->unmap_mapping_range)
+ *    ->i_mmap_mutex            (truncate->unmap_mapping_range)
  *
  *  ->mmap_sem
- *    ->i_mmap_lock
+ *    ->i_mmap_mutex
  *      ->page_table_lock or pte_lock   (various, mainly in memory.c)
  *        ->mapping->tree_lock  (arch-dependent flush_dcache_mmap_lock)
  *
@@ -84,7 +84,7 @@
  *    sb_lock                   (fs/fs-writeback.c)
  *    ->mapping->tree_lock      (__sync_single_inode)
  *
- *  ->i_mmap_lock
+ *  ->i_mmap_mutex
  *    ->anon_vma.lock           (vma_adjust)
  *
  *  ->anon_vma.lock
@@ -106,7 +106,7 @@
  *
  *  (code doesn't rely on that order, so you could switch it around)
  *  ->tasklist_lock             (memory_failure, collect_procs_ao)
- *    ->i_mmap_lock
+ *    ->i_mmap_mutex
  */
 
 /*
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 83364df74a33..93356cd12828 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -183,7 +183,7 @@ __xip_unmap (struct address_space * mapping,
                 return;
 
 retry:
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
                 mm = vma->vm_mm;
                 address = vma->vm_start +
@@ -201,7 +201,7 @@ retry:
                         page_cache_release(page);
                 }
         }
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
 
         if (locked) {
                 mutex_unlock(&xip_sparse_mutex);
diff --git a/mm/fremap.c b/mm/fremap.c
index ec520c7b28df..7f4123056e06 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -211,13 +211,13 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
                         }
                         goto out;
                 }
-                spin_lock(&mapping->i_mmap_lock);
+                mutex_lock(&mapping->i_mmap_mutex);
                 flush_dcache_mmap_lock(mapping);
                 vma->vm_flags |= VM_NONLINEAR;
                 vma_prio_tree_remove(vma, &mapping->i_mmap);
                 vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear);
                 flush_dcache_mmap_unlock(mapping);
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
         }
 
         if (vma->vm_flags & VM_LOCKED) {
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bbb4a5bbb958..5fd68b95c671 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2205,7 +2205,7 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
         unsigned long sz = huge_page_size(h);
 
         /*
-         * A page gathering list, protected by per file i_mmap_lock. The
+         * A page gathering list, protected by per file i_mmap_mutex. The
          * lock is used to avoid list corruption from multiple unmapping
          * of the same page since we are using page->lru.
          */
@@ -2274,9 +2274,9 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
                           unsigned long end, struct page *ref_page)
 {
-        spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
+        mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
         __unmap_hugepage_range(vma, start, end, ref_page);
-        spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
+        mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
 }
 
 /*
@@ -2308,7 +2308,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
          * this mapping should be shared between all the VMAs,
          * __unmap_hugepage_range() is called as the lock is already held
          */
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(iter_vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
                 /* Do not unmap the current VMA */
                 if (iter_vma == vma)
@@ -2326,7 +2326,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
                                 address, address + huge_page_size(h),
                                 page);
         }
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
 
         return 1;
 }
@@ -2810,7 +2810,7 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
         BUG_ON(address >= end);
         flush_cache_range(vma, address, end);
 
-        spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
+        mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
         spin_lock(&mm->page_table_lock);
         for (; address < end; address += huge_page_size(h)) {
                 ptep = huge_pte_offset(mm, address);
@@ -2825,7 +2825,7 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
                 }
         }
         spin_unlock(&mm->page_table_lock);
-        spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
+        mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
 
         flush_tlb_range(vma, start, end);
 }
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2b9a5eef39e0..12178ec32ab5 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -429,7 +429,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
          */
 
         read_lock(&tasklist_lock);
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         for_each_process(tsk) {
                 pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
 
@@ -449,7 +449,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
                                 add_to_kill(tsk, page, vma, to_kill, tkc);
                 }
         }
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         read_unlock(&tasklist_lock);
 }
 
diff --git a/mm/memory.c b/mm/memory.c
index 18655878b9f8..7bbe4d3df756 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2667,12 +2667,12 @@ void unmap_mapping_range(struct address_space *mapping,
                 details.last_index = ULONG_MAX;
 
 
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         if (unlikely(!prio_tree_empty(&mapping->i_mmap)))
                 unmap_mapping_range_tree(&mapping->i_mmap, &details);
         if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
                 unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
 }
 EXPORT_SYMBOL(unmap_mapping_range);
 
diff --git a/mm/mmap.c b/mm/mmap.c
index 50cb04bb56bf..26efbfca0b20 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -194,7 +194,7 @@ error:
 }
 
 /*
- * Requires inode->i_mapping->i_mmap_lock
+ * Requires inode->i_mapping->i_mmap_mutex
  */
 static void __remove_shared_vm_struct(struct vm_area_struct *vma,
                 struct file *file, struct address_space *mapping)
@@ -222,9 +222,9 @@ void unlink_file_vma(struct vm_area_struct *vma)
 
         if (file) {
                 struct address_space *mapping = file->f_mapping;
-                spin_lock(&mapping->i_mmap_lock);
+                mutex_lock(&mapping->i_mmap_mutex);
                 __remove_shared_vm_struct(vma, file, mapping);
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
         }
 }
 
@@ -446,13 +446,13 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
                 mapping = vma->vm_file->f_mapping;
 
         if (mapping)
-                spin_lock(&mapping->i_mmap_lock);
+                mutex_lock(&mapping->i_mmap_mutex);
 
         __vma_link(mm, vma, prev, rb_link, rb_parent);
         __vma_link_file(vma);
 
         if (mapping)
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
 
         mm->map_count++;
         validate_mm(mm);
@@ -555,7 +555,7 @@ again:			remove_next = 1 + (end > next->vm_end);
                 mapping = file->f_mapping;
                 if (!(vma->vm_flags & VM_NONLINEAR))
                         root = &mapping->i_mmap;
-                spin_lock(&mapping->i_mmap_lock);
+                mutex_lock(&mapping->i_mmap_mutex);
                 if (insert) {
                         /*
                          * Put into prio_tree now, so instantiated pages
@@ -622,7 +622,7 @@ again:			remove_next = 1 + (end > next->vm_end);
         if (anon_vma)
                 anon_vma_unlock(anon_vma);
         if (mapping)
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
 
         if (remove_next) {
                 if (file) {
@@ -2290,7 +2290,7 @@ void exit_mmap(struct mm_struct *mm)
 
 /* Insert vm structure into process list sorted by address
  * and into the inode's i_mmap tree.  If vm_file is non-NULL
- * then i_mmap_lock is taken here.
+ * then i_mmap_mutex is taken here.
  */
 int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma)
 {
@@ -2532,7 +2532,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
                  */
                 if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
                         BUG();
-                spin_lock_nest_lock(&mapping->i_mmap_lock, &mm->mmap_sem);
+                mutex_lock_nest_lock(&mapping->i_mmap_mutex, &mm->mmap_sem);
         }
 }
 
@@ -2559,7 +2559,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
  * vma in this mm is backed by the same anon_vma or address_space.
  *
  * We can take all the locks in random order because the VM code
- * taking i_mmap_lock or anon_vma->lock outside the mmap_sem never
+ * taking i_mmap_mutex or anon_vma->lock outside the mmap_sem never
  * takes more than one of them in a row. Secondly we're protected
  * against a concurrent mm_take_all_locks() by the mm_all_locks_mutex.
  *
@@ -2631,7 +2631,7 @@ static void vm_unlock_mapping(struct address_space *mapping)
                  * AS_MM_ALL_LOCKS can't change to 0 from under us
                  * because we hold the mm_all_locks_mutex.
                  */
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
                 if (!test_and_clear_bit(AS_MM_ALL_LOCKS,
                                         &mapping->flags))
                         BUG();
diff --git a/mm/mremap.c b/mm/mremap.c
index 909e1e1e99b1..506fa44403df 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -93,7 +93,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
                  * and we propagate stale pages into the dst afterward.
                  */
                 mapping = vma->vm_file->f_mapping;
-                spin_lock(&mapping->i_mmap_lock);
+                mutex_lock(&mapping->i_mmap_mutex);
         }
 
         /*
@@ -122,7 +122,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
         pte_unmap(new_pte - 1);
         pte_unmap_unlock(old_pte - 1, old_ptl);
         if (mapping)
-                spin_unlock(&mapping->i_mmap_lock);
+                mutex_unlock(&mapping->i_mmap_mutex);
         mmu_notifier_invalidate_range_end(vma->vm_mm, old_start, old_end);
 }
 
diff --git a/mm/rmap.c b/mm/rmap.c
index 522e4a93cadd..f0ef7ea5423a 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -24,7 +24,7 @@
  *   inode->i_alloc_sem (vmtruncate_range)
  *   mm->mmap_sem
  *     page->flags PG_locked (lock_page)
- *       mapping->i_mmap_lock
+ *       mapping->i_mmap_mutex
  *         anon_vma->lock
  *           mm->page_table_lock or pte_lock
  *             zone->lru_lock (in mark_page_accessed, isolate_lru_page)
@@ -646,14 +646,14 @@ static int page_referenced_file(struct page *page,
          * The page lock not only makes sure that page->mapping cannot
          * suddenly be NULLified by truncation, it makes sure that the
          * structure at mapping cannot be freed and reused yet,
-         * so we can safely take mapping->i_mmap_lock.
+         * so we can safely take mapping->i_mmap_mutex.
          */
         BUG_ON(!PageLocked(page));
 
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
 
         /*
-         * i_mmap_lock does not stabilize mapcount at all, but mapcount
+         * i_mmap_mutex does not stabilize mapcount at all, but mapcount
          * is more likely to be accurate if we note it after spinning.
          */
         mapcount = page_mapcount(page);
@@ -675,7 +675,7 @@ static int page_referenced_file(struct page *page,
                         break;
         }
 
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         return referenced;
 }
 
@@ -762,7 +762,7 @@ static int page_mkclean_file(struct address_space *mapping, struct page *page)
 
         BUG_ON(PageAnon(page));
 
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
                 if (vma->vm_flags & VM_SHARED) {
                         unsigned long address = vma_address(page, vma);
@@ -771,7 +771,7 @@ static int page_mkclean_file(struct address_space *mapping, struct page *page)
                         ret += page_mkclean_one(page, vma, address);
                 }
         }
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         return ret;
 }
 
@@ -1119,7 +1119,7 @@ out_mlock:
         /*
          * We need mmap_sem locking, Otherwise VM_LOCKED check makes
          * unstable result and race. Plus, We can't wait here because
-         * we now hold anon_vma->lock or mapping->i_mmap_lock.
+         * we now hold anon_vma->lock or mapping->i_mmap_mutex.
          * if trylock failed, the page remain in evictable lru and later
          * vmscan could retry to move the page to unevictable lru if the
          * page is actually mlocked.
@@ -1345,7 +1345,7 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
         unsigned long max_nl_size = 0;
         unsigned int mapcount;
 
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
                 unsigned long address = vma_address(page, vma);
                 if (address == -EFAULT)
@@ -1391,7 +1391,7 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
         mapcount = page_mapcount(page);
         if (!mapcount)
                 goto out;
-        cond_resched_lock(&mapping->i_mmap_lock);
+        cond_resched();
 
         max_nl_size = (max_nl_size + CLUSTER_SIZE - 1) & CLUSTER_MASK;
         if (max_nl_cursor == 0)
@@ -1413,7 +1413,7 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
                         }
                         vma->vm_private_data = (void *) max_nl_cursor;
                 }
-                cond_resched_lock(&mapping->i_mmap_lock);
+                cond_resched();
                 max_nl_cursor += CLUSTER_SIZE;
         } while (max_nl_cursor <= max_nl_size);
 
@@ -1425,7 +1425,7 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
         list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
                 vma->vm_private_data = NULL;
 out:
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         return ret;
 }
 
@@ -1544,7 +1544,7 @@ static int rmap_walk_file(struct page *page, int (*rmap_one)(struct page *,
 
         if (!mapping)
                 return ret;
-        spin_lock(&mapping->i_mmap_lock);
+        mutex_lock(&mapping->i_mmap_mutex);
         vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
                 unsigned long address = vma_address(page, vma);
                 if (address == -EFAULT)
@@ -1558,7 +1558,7 @@ static int rmap_walk_file(struct page *page, int (*rmap_one)(struct page *,
          * never contain migration ptes.  Decide what to do about this
          * limitation to linear when we need rmap_walk() on nonlinear.
          */
-        spin_unlock(&mapping->i_mmap_lock);
+        mutex_unlock(&mapping->i_mmap_mutex);
         return ret;
 }