svn commit: r235931 - head/sys/powerpc/include

[Marcel Moolenaar]

On May 24, 2012, at 3:15 PM, Nathan Whitehorn wrote:

>>> Summary:
>>> 1. *mb() must be lwsync or sync on all machines, except for wmb() which could be eieio
>>> 2. __ATOMIC_ACQ() must be isync (though could be reduced to lwsync with bus_space changes)
>>> 3. __ATOMIC_REL() must be lwsync or sync
>> 
>> This is absolutely not what I concluded from our discussions. I have no idea
>> how we could end up so out of sync...
>> 
> 
> Thanks for the quick change. No idea how we got out of sync. I find all of this synchronization stuff a little mind-bending, so sorry for any miscommunication. __ATOMIC_ACQ() needed to also be isync on ppc64, so I've fixed that up. Things should be good now.

Ok. I didn't change wmb() to eieio as I wanted to avoid a pendulum effect.
I'll reread our emails and make sure wmb() is what we think it is and if
so I'll do a followup commit.
FYI,

-- 
Marcel Moolenaar
marcel at xcllnt.net