mm/mmap.c: remove the first mapping check

Remove the first mapping check for vma_link.  Move the mutex_lock into the
braces when vma->vm_file is true.

Signed-off-by: Huang Shijie <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/mmap.c b/mm/mmap.c
index 6cdec3a6f4bfb5687833d5383576511f0e26b689..8a56d39df4ed2af8c46be660dfc73056798fced4 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -640,11 +640,10 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
 {
        struct address_space *mapping = NULL;
 
-       if (vma->vm_file)
+       if (vma->vm_file) {
                mapping = vma->vm_file->f_mapping;
-
-       if (mapping)
                mutex_lock(&mapping->i_mmap_mutex);
+       }
 
        __vma_link(mm, vma, prev, rb_link, rb_parent);
        __vma_link_file(vma);