From: david.vrabel@citrix.com (David Vrabel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64
Date: Tue, 3 Dec 2013 17:10:50 +0000 [thread overview]
Message-ID: <529E109A.7050700@citrix.com> (raw)
In-Reply-To: <1386085237-8334-1-git-send-email-julien.grall@linaro.org>
On 03/12/13 15:40, 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.
I'm now satisfied that this is the right thing to do.
Acked-by: David Vrabel <david.vrabel@citrix.com>
David
WARNING: multiple messages have this Message-ID (diff)
From: David Vrabel <david.vrabel@citrix.com>
To: Julien Grall <julien.grall@linaro.org>
Cc: <xen-devel@lists.xenproject.org>, <patches@linaro.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
Roger Pau Monne <roger.pau@citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Ian Campbell <ian.campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64
Date: Tue, 3 Dec 2013 17:10:50 +0000 [thread overview]
Message-ID: <529E109A.7050700@citrix.com> (raw)
In-Reply-To: <1386085237-8334-1-git-send-email-julien.grall@linaro.org>
On 03/12/13 15:40, 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.
I'm now satisfied that this is the right thing to do.
Acked-by: David Vrabel <david.vrabel@citrix.com>
David
next prev parent reply other threads:[~2013-12-03 17:10 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 15:40 [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64 Julien Grall
2013-12-03 15:40 ` Julien Grall
2013-12-03 16:00 ` One Thousand Gnomes
2013-12-03 16:00 ` One Thousand Gnomes
2013-12-03 16:00 ` One Thousand Gnomes
2013-12-03 16:19 ` Julien Grall
2013-12-03 16:19 ` Julien Grall
2013-12-03 16:32 ` One Thousand Gnomes
2013-12-03 16:32 ` One Thousand Gnomes
2013-12-03 16:41 ` Ian Campbell
2013-12-03 16:41 ` Ian Campbell
2013-12-03 17:03 ` One Thousand Gnomes
2013-12-03 17:03 ` One Thousand Gnomes
2013-12-03 18:03 ` Konrad Rzeszutek Wilk
2013-12-03 18:03 ` Konrad Rzeszutek Wilk
2013-12-03 18:03 ` Konrad Rzeszutek Wilk
2013-12-03 17:03 ` One Thousand Gnomes
2013-12-03 16:41 ` Ian Campbell
2013-12-03 16:32 ` One Thousand Gnomes
2013-12-03 16:19 ` Julien Grall
2013-12-03 17:10 ` David Vrabel
2013-12-03 17:10 ` David Vrabel [this message]
2013-12-03 17:10 ` David Vrabel
2013-12-03 18:01 ` Konrad Rzeszutek Wilk
2013-12-03 18:01 ` Konrad Rzeszutek Wilk
2013-12-03 18:01 ` Konrad Rzeszutek Wilk
2013-12-12 14:19 ` [Xen-devel] " Ian Campbell
2013-12-12 14:19 ` Ian Campbell
2013-12-12 15:11 ` Roger Pau Monné
2013-12-12 15:11 ` [Xen-devel] " Roger Pau Monné
2013-12-12 15:11 ` Roger Pau Monné
2013-12-12 14:19 ` Ian Campbell
-- strict thread matches above, loose matches on Subject: below --
2013-12-03 15:40 Julien Grall
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