Re: [PATCH] ARM: stm32: Reduce FORCE_MAX_ZONEORDER to 9

From: Maxime Coquelin
Date: Tue Aug 25 2015 - 17:03:36 EST

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
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?

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