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

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Date:   Sun, 7 Feb 2021 18:23:28 +0900
From:   Hector Martin 'marcan' <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 07/02/2021 00.46, Marc Zyngier wrote:
>>   config ARCH_APPLE
>>   	bool "Apple Silicon SoC family"
>>   	select GENERIC_IRQ_CHIP
>> +	select ARM64_FIQ_SUPPORT
> 
> Ah, this is what I was expecting in the previous patch. I guess the
> initial ARCH_APPLE patch could be moved down the line and add all the
> dependencies in one go.

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?

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...

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.

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