This patch implements a set of Feroceon-specific
{copy,clear}_user_page() routines that perform more optimally than
the generic implementations.  This also deals with write-allocate
caches (Feroceon can run L1 D in WA mode) which otherwise prevents
Linux from booting.

[nico: optimized the code even further]
Signed-off-by: NLennert Buytenhek <buytenh@marvell.com>
Tested-by: NSylver Bruneau <sylver.bruneau@googlemail.com>
Tested-by: NMartin Michlmayr <tbm@cyrius.com>
Signed-off-by: NNicolas Pitre <nico@marvell.com>