tree cddb3dcb163db01dd9af6e39ca4aee6f1a5470c5
parent 47a191fd38ebddb1bd1510ec2bc1085c578c8868
author Matthew Wilcox <matthew.r.wilcox@intel.com> 1401923268 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1401926042 -0700

swap: use bdev_read_page() / bdev_write_page()

By calling the device driver to write the page directly, we avoid
allocating a BIO, which allows us to free memory without allocating
memory.

[akpm@linux-foundation.org: fix used-uninitialized bug]
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dheeraj Reddy <dheeraj.reddy@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>