linux-kernel - Re: [PATCH] arm64: Enable CONFIG

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Message-ID: <20141204182049.GB7749@arm.com>
Date:	Thu, 4 Dec 2014 18:20:49 +0000
From:	Will Deacon <will.deacon@....com>
To:	Alexander Graf <agraf@...e.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH] arm64: Enable CONFIG_COMPAT also for 64k page size

On Thu, Dec 04, 2014 at 03:46:33PM +0000, Alexander Graf wrote:
> With binutils 2.25 the default alignment for 32bit arm sections changed to
> have everything 64k aligned. Armv7 binaries built with this binutils version
> run successfully on an arm64 system.
> 
> Since effectively there is now the chance to run armv7 code on arm64 even
> with 64k page size, it doesn't make sense to block people from enabling
> CONFIG_COMPAT on those configurations.

Is there a distro available that is built with a recent enough binutils for
this? I'd really like to run our regression tests to check that page-size
assumptions don't exist for things like shm.

Will

> 
> Signed-off-by: Alexander Graf <agraf@...e.de>
> ---
>  arch/arm64/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 9532f8d..3cf4f238 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -409,7 +409,6 @@ source "fs/Kconfig.binfmt"
>  
>  config COMPAT
>  	bool "Kernel support for 32-bit EL0"
> -	depends on !ARM64_64K_PAGES
>  	select COMPAT_BINFMT_ELF
>  	select HAVE_UID16
>  	select OLD_SIGSUSPEND3
> -- 
> 1.7.12.4
> 
> 
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