On Fri, 7 Nov 2008, Mathieu Desnoyers wrote:
>
> I want to make sure
>
> __m_cnt_hi
> is read before
> mmio cnt_lo read
Hmm, let me make sure I understand why there is no wmb.
Paul, can you verify this?
Mathieu, you do the following:
read a
smp_rmb
reab b
if (test b)
write a
So the idea is that you must read b to test it. And since we must read a
before reading b we can see that we write a before either?
The question remains, can the write happen before either of the reads?
But since the read b is reading the hw clock, perhaps that just implies a
wmb on the hardware side?
-- Steve
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