linux-kernel - Re: [PATCH] ARM: irq: Add IRQ_SET_MASK_OK_DONE handling in migrate_one

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Message-ID: <29e5c472-40b0-f7e2-e04e-ef3093f997a6@arm.com>
Date:   Thu, 10 Jan 2019 11:12:20 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Marc Zyngier <marc.zyngier@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: irq: Add IRQ_SET_MASK_OK_DONE handling in
 migrate_one_irq()

On 1/9/19 5:21 PM, Marc Zyngier wrote:
> On 09/01/2019 15:47, Dietmar Eggemann wrote:
>> Hi Marc,
>>
>> On 1/8/19 3:16 PM, Marc Zyngier wrote:
>>> Hi Dietmar,
>>>
>>> On 08/01/2019 13:58, Dietmar Eggemann wrote:

[...]

>>> On the arm64 side, we've solved the exact same issue by getting rid of
>>> this code and using the generic implementation. See 217d453d473c5
>>> ("arm64: fix a migrating irq bug when hotplug cpu"), which uses
>>> irq_migrate_all_off_this_cpu instead.
>>>
>>> I'm not sure there is much value in not using the core code in this case.
>>
>> Thanks for the hint! Much more elegant! I tried the following on TC2 and
>> it worked just fine. I'm not aware on any drawbacks of using the generic
>> irq migration for Arm32 as well.
> 
> [...]
> 
> Sounds great! Can you put it in a proper patch and resend it?

Yes. I renamed the patch to "arm: fix a migrating irq bug when hotplug 
cpu" so it's closer to its arm64 counterpart patch.

https://lore.kernel.org/lkml/20190110100922.20280-1-dietmar.eggemann@arm.com/