A bunch of places passes volatile pointers to readb() et.al.;
sparc64 has their arguments declared as void __iomem *.  Prototypes
changed to match other platforms.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>