linux-kernel - Re: [Xen-devel] [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64

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Date:	Thu, 12 Dec 2013 16:11:59 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>,
	Julien Grall <julien.grall@...aro.org>
CC:	<xen-devel@...ts.xenproject.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>, <patches@...aro.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v2] xen/block: Correctly define structures
 in public headers on ARM32 and ARM64

On 12/12/13 15:19, Ian Campbell wrote:
> On Tue, 2013-12-03 at 15:40 +0000, Julien Grall wrote:
>> On ARM (32 bits and 64 bits), the double-word is 8-bytes aligned. This will
>> result on different structure from Xen and Linux repositories.
>>
>> As Linux is using __packed__ attribute, it must have a 4-bytes padding before
>> each "id" field.
>>
>> This change breaks guest block support with older kernel. IMHO, it's acceptable
>> because Xen on ARM is still on Tech Preview and the hypercall ABI is not yet
>> freezed.
>>
>> Only one architecture (x86_32) doesn't have 64-bit ABI for the block interface.
>> Don't add padding if Linux is compiled for this architecture.
> 
> Konrad asked for confirmation that this didn't change x86.

I've also tested this using various combinations of kernels, and it
seems to be perfectly fine, so:

Acked-by: Roger Pau Monné <roger.pau@...rix.com>

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