Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call

From	Eric Anholt <eric@anholt.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call
Date	2016-04-08 20:30 +0200
Message-ID	<rlJkm-82k-3@gated-at.bofh.it> (permalink)
References	<rkqa6-5dS-5@gated-at.bofh.it> <rkqa6-5dS-13@gated-at.bofh.it> <rkNT3-7pr-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Stephen Warren <swarren@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@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.

Thread

[PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call Eric Anholt <eric@anholt.net> - 2016-04-05 05:50 +0200
  Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier  call Stephen Warren <swarren@wwwdotorg.org> - 2016-04-06 07:10 +0200
    Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call Eric Anholt <eric@anholt.net> - 2016-04-08 20:30 +0200
      Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier  call Stephen Warren <swarren@wwwdotorg.org> - 2016-04-09 07:30 +0200
        Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call Eric Anholt <eric@anholt.net> - 2016-04-10 20:40 +0200
          Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier  call Stephen Warren <swarren@wwwdotorg.org> - 2016-04-11 18:00 +0200

csiph-web