linux-kernel - Re: [PATCH 11/18] arm64: Kconfig: Require FIQ support for ARCH

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Message-ID: <4ed0001c-2196-5e54-9de0-e77236b2a306@marcan.st>
Date:   Tue, 9 Feb 2021 00:48:05 +0900
From:   Hector Martin <marcan@...can.st>
To:     Marc Zyngier <maz@...nel.org>
Cc:     soc@...nel.org, linux-arm-kernel@...ts.infradead.org,
        robh+dt@...nel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 11/18] arm64: Kconfig: Require FIQ support for ARCH_APPLE

On 08/02/2021 21.05, Marc Zyngier wrote:
>> I was trying to introduce the Kconfig before the code that depends on
>> it; is it kosher to have it in the other order, looking for CONFIG_
>> defines that don't exist yet?
> 
> Absolutely. The only requirement is to make sure that nothing breaks in
> the middle of a series.
> 
>> Though in this case the only user earlier in the series is the Samsung
>> stuff, which doesn't care about FIQs, so I can just sort things as
>> FIQ->ARCH_APPLE->samsung->AIC...
> 
> Seems fine to me. Sorting out the infrastructure first (FIQ, memory
> attributes) first is a requirement anyway, so the ordering of the
> series could reflect that priority.

Cool, that simplifies things.

>> I'm not sure about AIC vs. ARCH_APPLE though. Right now the pattern is
>> that AIC depends on ARCH_APPLE and also defaults to that. But then you
>> can build with ARCH_APPLE and AIC disabled if you so choose, which
>> does result in a broken system on these machines. AIC should build
>> without ARCH_APPLE (as long as we're on ARM64), so we could reverse
>> that.
> 
> As long as ARCH_APPLE selects AIC, you can make AIC selectable on
> its own. What I'm trying to avoid is people ending up with an unbootable
> system, and not having interrupts is one thing that makes it really hard
> to debug...

Sounds good, I'll flip it over.

-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub