From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Wed, 7 Dec 2011 22:57:18 +0000
Subject: Bug#651215: Kernel fails to boot on NSLU2
In-Reply-To: <8739cwxcjd.fsf@lebrac.rtp-net.org>
References: <20111206194048.12063.82586.reportbug@vrnul03074nb.vr-netze.vrnet>
 <1323237747.18450.7.camel@deadeye> <8739cwxcjd.fsf@lebrac.rtp-net.org>
Message-ID: <20111207225718.GI14542@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Dec 07, 2011 at 11:05:58PM +0100, Arnaud Patard wrote:
> I may be wrong but it seems that arm_dma_zone_size is used before being
> set. It would be interesting if someone can boot test a nslu2 kernel with
> appended patch.

It does look like that's the case - arm_dma_zone_size is used in
arm_bootmem_free(), which is called from bootmem_init() and in turn
paging_init().

So, arm_dma_zone_size needs to be set before paging_init() is called.

I'd actually suggest moving it before:

        if (mdesc->restart_mode)
                reboot_setup(&mdesc->restart_mode);

so that it's set real early, to avoid any future problems with this.
The earlier these kinds of things are set, the less likely this kind
of bug will happen.