Don't use alternative_smp() in for __raw_spin_lock.  gcc
sometimes generates rip-relative addressing, so we can't
simply copy the instruction to another place.

Replace some leftover "lock;" with LOCK_PREFIX.

Fillup space with 0x90 (nop) instead of 0x42, so
"objdump -d -j .smp_altinstr_replacement vmlinux" gives more
readable results.

-- 
Gerd Hoffmann <kraxel@suse.de>
http://www.suse.de/~kraxel/julika-dora.jpeg