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mm: memory: remove ->vm_file check on shared writable vmas 

Shared anonymous mmaps are implemented with shmem files, so all VMAs with
shared writable semantics also have an underlying backing file.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2015-02-10 14:11:28 -08:00 committed by Linus Torvalds
parent d9ecee281b
commit 74ec67511d
1 changed files with 2 additions and 5 deletions
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7
mm/memory.c
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@ -2127,9 +2127,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
balance_dirty_pages_ratelimited(mapping);
}
/* file_update_time outside page_lock */
if (vma->vm_file)
file_update_time(vma->vm_file);
file_update_time(vma->vm_file);
}
put_page(dirty_page);
if (page_mkwrite) {
@ -2971,8 +2969,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
balance_dirty_pages_ratelimited(mapping);
}
/* file_update_time outside page_lock */
if (vma->vm_file && !vma->vm_ops->page_mkwrite)
if (!vma->vm_ops->page_mkwrite)
file_update_time(vma->vm_file);
return ret;