linux-kernel - Re: [PATCH] Fix kexec reboot on ARM

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Date:	Wed, 14 Dec 2011 08:08:02 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Chubb <peter.chubb@...ta.com.au>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH] Fix kexec reboot on ARM

On Wed, Dec 14, 2011 at 03:02:10PM +1100, Peter Chubb wrote:
> 
> When kexec() runs, it eventually sets up a 1-to-1 memory map, then
> invokes cpu_reset(). When it invokes cpu_reset (which turns
> off the MMU), it does so at its virtual address.  Across the code that
> disables the MMU, virtual and physical addresses have to be the same,
> otherwise after disabling the MMU, the PC is invalid.
> 
> The simplest fix is to invoke cpu_reset() at its one-to-one mapped
> address.
> 
> I've tested on KZM (arm v6) and Beagleboard (omap)

NAK.

Three reasons:

1. You've not signed-off the patch (please read
   Documentation/SubmittingPatches)
2. pre-ARMv6 do not expect this, and it will break where
   PHYS_OFFSET >= PAGE_OFFSET
3. Have you seen what's already queued for the next merge window?
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