From: Nathan Lynch <nathanl@austin.ibm.com>

Hit this in latest bk:

include/asm/spinlock.h: In function `_raw_read_lock':
include/asm/spinlock.h:198: warning: passing arg 1 of `__rw_yield' from incompatible pointer type
include/asm/spinlock.h: In function `_raw_write_lock':
include/asm/spinlock.h:255: warning: passing arg 1 of `__rw_yield' from incompatible pointer type

This seems to have been broken by the out-of-line spinlocks patch.
You won't hit it unless you've enabled CONFIG_PPC_SPLPAR.  Use the
rwlock_t for the argument type, and move the definition of rwlock_t up
next to that of spinlock_t.
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>