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From: Michael Ellerman <michael@ellerman.id.au>
To: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] kdump: Fix for machine checkstop on DMA fault
Date: Thu, 23 Mar 2006 17:06:27 +1100
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Cc: Milton Miller <miltonm@bga.com>, Paul Mackerras <paulus@samba.org>,
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On Thu, 23 Mar 2006 16:38, Olof Johansson wrote:
> On Wed, Mar 22, 2006 at 08:30:26PM -0800, Haren Myneni wrote:
> > Paul, If you are OK with this fix, please send it upstream.
> >
> > Thanks
> > Haren
> >
> > - Some machines checkstop on dma protection fault for ongoing DMA left
> > in the first kernel. Since, we do not shutdown devices before the kdump
> > boot, let them continue DMA to old kernel space.
>
> How is this solved for regular kexec, doesn't the same problem exist
> there?

The idea for normal kexec is that the kernel should have shut everything do=
wn=20
properly. It's a bug if there are still DMAs going on. Hopefully.

cheers

=2D-=20
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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