Merge Question on asm-ppc*/rwsem.h
Paul Mackerras
paulus at samba.org
Mon Sep 19 09:22:25 EST 2005
Jon Loeliger writes:
> Which begs the question, what is the "else smp_wmb();" clause
> really doing for us in the ppc32 case, and can we either
> get rid of it, or is it safe to add to the ppc64 case?
I think the difference is that the atomic ops that return a value also
have include a barrier on ppc64, but don't on ppc32 (although they
probably should). IOW I think the merged case should follow ppc64
here.
Paul.
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