Re: [PATCH] arch: Introduce read_acquire()

[David Miller]

From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx>
Date: Tue, 11 Nov 2014 13:12:32 -0800

> The architectures I need to sort out are arm, x86, sparc, ia64, and
> s390 as they are the only ones that tried to make use of the
> smp_load_acquire logic.

On sparc64, you don't have to worry about anything really.

Only mb() does anything.  The cpus execute in a reasonably strict
memory ordering mode, and that's why rmb/wmb and friends are simply
nops with a compiler barrier.
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