shmem: let shared anonymous be nonlinear again
commitc2234bf9dbc4db7b2f378c9ad0d59fd75f5793f0
authorHugh Dickins <hughd@google.com>
Tue, 22 Mar 2011 23:33:43 +0000 (22 16:33 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Sun, 27 Mar 2011 18:30:27 +0000 (27 11:30 -0700)
tree243facd19407b35f1eccfe8e69ab74136fa38528
parent5b390b74fb12f9b4b740eb8afd7dfe8d4889c3bc
shmem: let shared anonymous be nonlinear again

commit bee4c36a5cf5c9f63ce1d7372aa62045fbd16d47 upstream.

Up to 2.6.22, you could use remap_file_pages(2) on a tmpfs file or a
shared mapping of /dev/zero or a shared anonymous mapping.  In 2.6.23 we
disabled it by default, but set VM_CAN_NONLINEAR to enable it on safe
mappings.  We made sure to set it in shmem_mmap() for tmpfs files, but
missed it in shmem_zero_setup() for the others.  Fix that at last.

Reported-by: Kenny Simpson <theonetruekenny@yahoo.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
mm/shmem.c