linux-kernel - Re: [PATCH 02/36] ipc: Add COMPAT

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Message-ID: <20120718090345.GA25929@mudshark.cambridge.arm.com>
Date:	Wed, 18 Jul 2012 10:03:46 +0100
From:	Will Deacon <will.deacon@....com>
To:	Jon Masters <jonathan@...masters.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 02/36] ipc: Add COMPAT_SHMLBA support

On Wed, Jul 18, 2012 at 06:53:34AM +0100, Jon Masters wrote:
> On 07/06/2012 05:05 PM, Catalin Marinas wrote:
> 
> > The reason for this patch is that we want SHMLBA to be 64K on AArch64
> 
> Presumably this is to obviate differences between 64K or 4K pages?

Right, we don't have D-side aliasing with AArch64 processors, so SHMLBA can
be left as the minimum alignment requirement, which is PAGE_SIZE.

The compat bit is more fun because userspace expects to see 16k there.

Will
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