]> git.baikalelectronics.ru Git - kernel.git/commit
mm: memory: merge shared-writable dirtying branches in do_wp_page()
authorJohannes Weiner <hannes@cmpxchg.org>
Tue, 10 Feb 2015 22:11:30 +0000 (14:11 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 10 Feb 2015 22:30:34 +0000 (14:30 -0800)
commitf38b4b310d402055702c63b0989dbcd16adf9537
treebb931dc1e273ff0027243c596b795a0f504a59d7
parent74ec67511d36f9c731065b1dae7d9638a3b639d3
mm: memory: merge shared-writable dirtying branches in do_wp_page()

Whether there is a vm_ops->page_mkwrite or not, the page dirtying is
pretty much the same.  Make sure the page references are the same in both
cases, then merge the two branches.

It's tempting to go even further and page-lock the !page_mkwrite case, to
get it in line with everybody else setting the page table and thus further
simplify the model.  But that's not quite compelling enough to justify
dropping the pte lock, then relocking and verifying the entry for
filesystems without ->page_mkwrite, which notably includes tmpfs.  Leave
it for now and lock the page late in the !page_mkwrite case.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memory.c