Re: [PATCH 1/2] Revert "arm64: use cpu_online_mask when using forced irq_set_affinity"

From: Sudeep Holla
Date: Thu Aug 28 2014 - 05:49:33 EST

On 28/08/14 10:38, Will Deacon wrote:
On Wed, Aug 27, 2014 at 10:30:06AM +0100, byungchul.park@xxxxxxx wrote:
From: Byungchul Park <byungchul.park@xxxxxxx>

This reverts commit 601c942176d8ad8334118bddb747e3720bed24f8.

This patch is designed to ensure that the cpu being offlined is not
present in the affinity mask. But it is a bad idea to overwrite the
affinity variable with cpu_online_mask, even in case that the current
affinity already includes onlined cpus.

So revert this patch to replace it with another one doing exactly
what it intends.

Sudeep: what's the right way forward for this? There seems to be general
agreement that the existing code is broken, but a bunch of different
`fixes'. Can we just take a straight port of what tglx proposed for ARM?
(changing force to false)

Yes I agree but for that we need agreement from rmk and hence I asked to
wait till we hear from rmk. Main issue raised by rmk is if some other
interrupt controller implementation decide not to migrate away when
force is false(theoretically possible).


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