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

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Date:	Tue, 25 Aug 2015 23:03:29 +0200
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	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 08/25/2015 10:36 PM, Arnd Bergmann wrote:
> 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).
>

Both proposals seem reasonable.
I propose to make this entry configurable in defconfig if ARM_SINGLE_ARMV7M,
keeping the default to 11. Then, in efm32 and stm32 defconfig files, 
select value 9.

Uwe, is it ok for you?

Regards,
Maxime
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