M68k compiler updates from Roman Zippel:
  - Fix various lvalue warnings from newer gcc
  - Remove unnecessary volatile declarations
  - Change some constraints from "a" to "m" to generate slightly better code
  - Use "o" constraint for bitfield instructions
  - Use generic bitmap functions for some of the ext2/minix bitmap functions
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>