linux-kernel - Re: [PATCH] ARM: stm32: Reduce FORCE_MAX

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Date:	Tue, 25 Aug 2015 22:36:22 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Maxime Coquelin <mcoquelin.stm32@...il.com>, olof@...om.net,
	khilman@...nel.org, afaerber@...e.de,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: stm32: Reduce FORCE_MAX_ZONEORDER to 9

On Tuesday 25 August 2015 22:07:17 Maxime Coquelin wrote:
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index a750c14..57d53af 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1734,7 +1734,7 @@ config FORCE_MAX_ZONEORDER
>         int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
>         range 11 64 if ARCH_SHMOBILE_LEGACY
>         default "12" if SOC_AM33XX
> -       default "9" if SA1111 || ARCH_EFM32
> +       default "9" if SA1111 || ARCH_EFM32 || ARCH_STM32
>         default "11"
> 

This looks wrong now that we can enable multiple ARMV7M platforms
together. In practice it doesn't matter much, because you wouldn't
do that for a real-life system, but out of principle this seems
like something you'd better put into the defconfig file for
both ARCH_EFM32 and ARCH_STM32. We could also think about changing
the default to "9" for any ARM_SINGLE_ARMV7M config and increasing
it again in defconfig for any platform that actually has a lot of
RAM (if any).

The SOC_AM33XX is slightly different because it increases the default
rather than reducing it, presumably because the larger allocation is
actually required (for what?).

	Arnd
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