Re: [Fastboot] Re: Announce: dumpfs v0.01 - common RAS output API

[ebiederm@xmission.com (Eric W. Biederman)]

Andrew Morton <akpm@osdl.org> writes:

> Jesse Barnes <jbarnes@engr.sgi.com> wrote:
> >
> > On Wednesday, July 28, 2004 11:00 am, Eric W. Biederman wrote:
> > > > I think this could end up being a good thing.  It gives more people a
> > > > stake in making sure that driver shutdown() routines work well.
> > >
> > > Which actually is one of the items open for discussion currently.
> > > For kexec on panic do we want to run the shutdown() routines?
> > 
> > We'll have to do something about incoming dma traffic and other stuff that the
> 
> > devices might be doing.  Maybe a arch specific callout to do some chipset 
> > stuff?
> > 
> 
> Does ongoing DMA actually matter?  After all,the memory which is being
> dma-ed into is pre-reserved and allocated for that purpose, and the dump
> kernel won't be using it.

If we can ensure the addresses where the new kernel will run will never
have DMA pointed at them I actually don't think so.  This is why last
year I recommended building a kernel that runs at a non-default address
and finding a way to simply preload it there.

Eric