linux-kernel - Re: [PATCH v4 07/11] ARM: allow MULTIPLATFORM with !MMU

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Date:	Fri, 3 Apr 2015 21:09:31 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stefan Agner <stefan@...er.ch>
Cc:	shawn.guo@...aro.org, kernel@...gutronix.de,
	u.kleine-koenig@...gutronix.de, jason@...edaemon.net,
	olof@...om.net, arnd@...db.de, daniel.lezcano@...aro.org,
	tglx@...utronix.de, mark.rutland@....com, pawel.moll@....com,
	robh+dt@...nel.org, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, marc.zyngier@....com,
	mcoquelin.stm32@...il.com, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/11] ARM: allow MULTIPLATFORM with !MMU

On Fri, Apr 03, 2015 at 09:44:48PM +0200, Stefan Agner wrote:
> In order to support SoC with heterogenous CPU architectures (such
> as Freescale Vybrid/i.MXSX) it is preferable to use the same
> architecture (ARCH_MXC in this case) for the MMU enabled and !MMU
> CPU. Hence allow to select MULTIPLATFORM even without MMU.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  arch/arm/Kconfig | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 9f1f09a..636cb3f 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -230,7 +230,7 @@ config VECTORS_BASE
>  	  in size.
>  
>  config ARM_PATCH_PHYS_VIRT
> -	bool "Patch physical to virtual translations at runtime" if EMBEDDED
> +	bool "Patch physical to virtual translations at runtime" if EMBEDDED || (ARCH_MULTIPLATFORM && MMU)
>  	default y

This makes no sense.  Multiplatform MMU _requires_ this feature, so why
offer it to the user when multiplatform is enabled _and_ MMU is enabled?

Patch 7817/1 in the patch system tried doing something like you're trying
to do here - I wonder whether you've reviewed the mailing list for
previous discussions.

Given that it's Easter, I'm not going to re-state what I said last time
this came up, but instead leave you to do some research.  For example,
reading message id <20130819232411.GX23006@...00.arm.linux.org.uk>...

Thanks.

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