Revert "tmpfs: fix mempolicy object leaks"

This reverts commit f7bd8276f6169169b97cadaecd71d1c8545c094e.
Backport ZRAM from Linux 3.3.x
staging: Add Snappy compression support to zram (alt)

Google's Snappy data compression library is a faster alternative to LZO,
optimized for x86-64. On compressible input it compresses ~2.5x faster than LZO
and decompresses ~1.5-2x faster than LZO. On incompressible input, it skips the
input at 100x faster than LZO and decompresses ~4x faster than LZO.
It is released under BSD license.
This is a kernel port from user space C++ code.
The current intended use is with zram (see next patch in series).

Signed-off-by: Zeev Tarantov <zeev.tarantov@gmail.com>
Modified for use with patched Linux-Next ZRAM drivers by faux123
zram: Simplify zram disk resizing interface

Also remove unnecessary messages.
zram: Specify default disksize via menuconfig (in bytes)
fully ported ZRAM from Linux 3.3.x
optimize ZRAM