linux-kernel - Re: [PATCH 1/2] ARM: default PHYS

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Date:	Wed, 13 Nov 2013 11:46:49 +0000
From:	Jonathan Austin <jonathan.austin@....com>
To:	Ming Lei <tom.leiming@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: default PHYS_OFFSET if !MMU

Hi Ming,

On 13/11/13 11:15, Ming Lei wrote:
> From: Jonathan Austin <jonathan.austin@....com>
> 
> Set CONFIG_PAGE_OFFSET as PHYS_OFFSET when !MMU so that
> we can keep CONFIG_PAGE_OFFSET same with PAGE_OFFSET.
>

I'm not so sure about this commit message - I don't think
it makes sense...Should it not be more like:

------->8-------
Subject: ARM: set PAGE_OFFSET = PHYS_OFFSET if !MMU

With !MMU we still set PAGE_OFFSET to 0xC0000000, which
makes little sense and causes a regression on !MMU after
f6537f2f0eba4eba ("scripts/kallsyms: filter symbols not
kernel address space")

This patch sets PAGE_OFFSET to PHYS_OFFSET in the !MMU
case, fixing the regression (Tested on Cortex-R7/Vexpress)
--------8<---------

Russell: Will you pick this patch up from the list or does
it need to go in through the patch system?

Jonny

> This patch and patch 2/2 fix regression on !MMU by
> f6537f2f0eba4eba("scripts/kallsyms: filter symbols not
> in kernel address space")
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Jonathan Austin <jonathan.austin@....com>
> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> ---
>   arch/arm/Kconfig |    1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 799ef94..db708c4 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1560,6 +1560,7 @@ endchoice
>   
>   config PAGE_OFFSET
>   	hex
> +	default PHYS_OFFSET if !MMU
>   	default 0x40000000 if VMSPLIT_1G
>   	default 0x80000000 if VMSPLIT_2G
>   	default 0xC0000000
> 


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