[PATCH] ppc64: fix RAS irq handlers

[PATCH] ppc64: fix RAS irq handlers

Both arch/ppc64/kernel/ras.c and arch/ppc64/kernel/rtasd.c have a spinlock
variable declared static called "log_lock".  Since the code in these files
interact quit a lot, having two different locks with identical names is
manifestly confusing.  This patch renames both locks to something a little
clearer.  In the case of ras.c it also renames the buffer protected by the
lock to a more usefullly greppable name.

Signed-off-by: David Gibson <dwg@au.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>