linux-kernel - Re: [Qemu-devel] SCSI bus failures with qemu-arm in kernel 3.8+

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Message-ID: <CAFEAcA_KJwzefBH0St2vbGd9gaWsVL9jdrGRBJU9wx2-kuo1vA@mail.gmail.com>
Date:	Tue, 13 Aug 2013 10:12:59 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Rob Landley <rob@...dley.net>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Guenter Roeck <linux@...ck-us.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, qemu-devel@...gnu.org,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [Qemu-devel] SCSI bus failures with qemu-arm in kernel 3.8+

On 13 August 2013 09:37, Rob Landley <rob@...dley.net> wrote:
> Peter says he knows somebody who knows somebody who dug some instance of
> this hardware out of some landfill or something.

No, I personally myself had the hardware. Really.

> Me, I want to get something that works on new qemu _and_ last year's
> qemu, and that's what I got.

Note that in general hoping that current mainline kernel will
always work with ancient QEMU is a losing proposition -- it is
always possible that a kernel improvement will trigger a latent
model bug in QEMU. (To pick a random example, some while ago fixes
to how the kernel dealt with BGR and RGB pixel formats on the
versatile board broke QEMU because we weren't modelling it right;
that was just a QEMU bug for which the fix is "get a newer QEMU".)

The back-compat in the PCI code is so that the older kernels (2.6.x)
will continue to work, which is not quite the same thing.

-- PMM
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