On Mon, 23 Jul 2012, Benjamin Herrenschmidt wrote: > On Sat, 2012-07-21 at 19:47 -0700, Hugh Dickins wrote: > > I have to revert the patch below from mmotm 2012-07-20-16-30 or > > next-20120720 in order to boot on the PowerPC G5: otherwise it > > freezes before switching to the framebuffer console - but I'm > > not certain where because that initial console doesn't scroll > > (there are mpic messages at bottom and at top of screen, probably > > later messages at the top but I don't know the sequence). > > This fixes it
Confirmed: many thanks, Ben. > (Grant, how do we avoid bisection breakage here ? I can > put that in -powerpc and we can make sure that gets merged before your > tree ?) > > powerpc/mpic: Create a revmap with enough entries for IPIs and timers > > The current mpic code creates a linear revmap just big enough for all > the sources, which happens to miss the IPIs and timers on some machines. > > This will in turn break when the irqdomain code loses the fallback of > doing a linear search when the revmap fails (and really slows down IPIs > otherwise). > > This happens for example on the U4 based Apple machines such as the > dual core PowerMac G5s. > > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> > --- > diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c > index 906f29c..bfc6211 100644 > --- a/arch/powerpc/sysdev/mpic.c > +++ b/arch/powerpc/sysdev/mpic.c > @@ -1376,7 +1376,7 @@ struct mpic * __init mpic_alloc(struct device_node > *node, > mpic->isu_mask = (1 << mpic->isu_shift) - 1; > > mpic->irqhost = irq_domain_add_linear(mpic->node, > - last_irq + 1, > + intvec_top, > &mpic_host_ops, mpic); > > /* > > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
