64-bit ppc rwsem

[Benjamin Herrenschmidt]

On Wed, 2010-08-18 at 22:29 -0700, David Miller wrote:
> From: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Date: Thu, 19 Aug 2010 15:23:23 +1000
> 
> > Similar here, but using atomic_long_t instead so it works for 32-bit too
> > for me. I suppose we could make that part common indeed.
> > 
> > What about asm-generic/rwsem-atomic.h  or rwsem-cmpxchg.h ?
> 
> Using rwsem-cmpxchg.h sounds best I guess.

Ok, I'll send a new patch tomorrow that does that.

Cheers,
Ben.