[RFC/PATCH] powerpc: Fix kdump EOI bug (often exhibits as dead console)

Benjamin Herrenschmidt benh at kernel.crashing.org
Mon Mar 13 19:44:12 EST 2006

On Mon, 2006-03-13 at 19:16 +1100, Michael Ellerman wrote:
> If we take an interrupt, and while processing it, decide to kdump we never
> EOI that interrupt. This can happen for any interrupt, but most commonly it's
> the console interrupt from a user hitting 'sysrq-c', which prevents the
> console from working in the second kernel.
> We're panicking so we don't want to do any more than we need to in the first
> kernel, so leave things alone there. When we come back up iff we reenable the
> interrupt in question, do an EOI then. This fixes the bug for me, and appears
> to cause no issue for other interrupts.

You may want to do the same for mpic.c ...


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