Re: [PATCH 6/24] make atomic_read() behave consistently on frv

[Segher Boessenkool]

> > > Well if there is only one memory location involved, then smp_rmb()
> > > isn't
> > > going to really do anything anyway, so it would be incorrect to use 
> > > it.
> >
> > rmb() orders *any* two reads; that includes two reads from the same
> > location.
>
> If the two reads are to the same location, all CPUs I am aware of
> will maintain the ordering without need for a memory barrier.

That's true of course, although there is no real guarantee for that.


Segher

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