linux-kernel - Re: [PATCH] powerpc: Make 256k pages depend on PPC32=n

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Date:	Tue, 19 Aug 2014 17:19:11 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Pranith Kumar <bobby.prani@...il.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	"open list:LINUX FOR POWERPC..." <linuxppc-dev@...ts.ozlabs.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: Make 256k pages depend on PPC32=n

On Tue, 2014-08-19 at 17:36 -0400, Pranith Kumar wrote:
> 256k pages are not tested on PPC32. On a randconfig I got the following error:
> 
> arch/powerpc/kernel/misc_32.S:1171: Error: operand out of range (0x0000000000010000 is not between 0xffffffffffff8000 and 0x0000000000007fff)
> 
> Disable 256K pages if PPC32=y
> 
> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
> ---
>  arch/powerpc/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index da16ffe..6cc518f 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -556,7 +556,7 @@ config PPC_64K_PAGES
>  
>  config PPC_256K_PAGES
>  	bool "256k page size" if 44x
> -	depends on !STDBINUTILS
> +	depends on !PPC32 && !STDBINUTILS
>  	help
>  	  Make the page size 256k.
>  

How will this ever be selected then?  44x is 32-bit only.

-Scott


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