[PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call
eric at anholt.net
Fri Apr 8 11:20:30 PDT 2016
Stephen Warren <swarren at wwwdotorg.org> writes:
> On 04/04/2016 09:44 PM, Eric Anholt wrote:
>> dsb() requires an argument on arm64, so we needed to add "sy".
>> Instead, take this opportunity to switch to the same smp_wmb() call
>> that gic uses for its IPIs. This is a less strong barrier than we
>> were doing before (dmb(ishst) compared to dsb(sy)), but it seems to be
>> the correct one.
> I assume all MMIO is part of the ish domain?
> If so, the series,
> Acked-by: Stephen Warren <swarren at wwwdotorg.org>
I don't know if this barrier implies ordering all the way out to AXI on
this HW, but I don't think that's a requirement of this function.
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