Commit 74ec6751 authored Feb 10, 2015 by Johannes Weiner Committed by Linus Torvalds Feb 10, 2015

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>

parent d9ecee28

mm/memory.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -2127,8 +2127,6 @@ reuse:
		balance_dirty_pages_ratelimited(mapping);
		}

		/* file_update_time outside page_lock */
		if (vma->vm_file)
		file_update_time(vma->vm_file);
		}
		put_page(dirty_page);
		@@ -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;

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