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Date: Mon, 26 Nov 2007 13:41:37 -0200 From: Luke Browning <lukebr@...ux.vnet.ibm.com> To: michael@...erman.id.au Cc: Thomas Klein <osstklei@...ibm.com>, Michael Neuling <mikey@...ling.org>, Jeff Garzik <jeff@...zik.org>, Jan-Bernd Themann <themann@...ibm.com>, netdev <netdev@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-ppc <linuxppc-dev@...abs.org>, Christoph Raisch <raisch@...ibm.com>, Paul Mackerras <paulus@...ba.org>, Marcus Eder <meder@...ibm.com>, Stefan Roscher <stefan.roscher@...ibm.com> Subject: Re: [PATCH] ehea: Add kdump support On Mon, 2007-11-26 at 19:16 +1100, Michael Ellerman wrote: > > Hi Thomas, > > I'm sorry, but this patch is all wrong IMHO. > > For kdump we have to assume that the kernel is fundamentally broken, > we've panicked, so something bad has happened - every line of kernel > code that is run decreases the chance that we'll successfully make it > into the kdump kernel. I agree with Michael. > Solutions that might be better: > > a) if there are a finite number of handles and we can predict their > values, just delete them all in the kdump kernel before the driver > loads. This is a good solution if handles are predefined. > b) if there are a small & finite number of handles, save their values > in a device tree property and have the kdump kernel read them and > delete them before the driver loads. Also good but is more complicated. > c) if neither of those work, provide a minimal routine that _only_ > deletes the handles in the crashed kernel. > d) <something else> Can the driver or configuration method for the driver query PHYP to determine if there are any pre-existing mappings... Regards, Luke - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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