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

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Message-ID: <548581A4.1010206@suse.de>
Date:	Mon, 08 Dec 2014 11:47:00 +0100
From:	Alexander Graf <agraf@...e.de>
To:	Will Deacon <will.deacon@....com>
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>,
	Michael Matz <matz@...e.de>
Subject: Re: [PATCH] arm64: Enable CONFIG_COMPAT also for 64k page size



On 08.12.14 11:10, Will Deacon wrote:
> On Sat, Dec 06, 2014 at 05:23:59PM +0000, Alexander Graf wrote:
>> On 04.12.14 19:20, Will Deacon wrote:
>>> 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.
>>
>> So how much of a distro do you need? I could probably assemble a simple
>> very minimalistic rootfs with only bash if that helps.
> 
> I'd like to run LTP, so I'd probably need slightly more than that but I
> certainly don't need the whole world.

Let me check with a few folks what we can easily assemble :).


Alex
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