On Wed, Nov 22, 2006 at 11:17:17AM -0500, Vivek Goyal wrote:
> On Tue, Nov 21, 2006 at 03:58:53PM -0800, Judith Lebzelter wrote:
> > > gsi_irq_sharing(gsi) {
> > > BUG_ON(gsi >= NR_IRQ_VECTORS);
> > > }
> > >
> > > Now interesting thing to find out is howcome this gsi became greater than
> > > NR_IRQ_VECTORS? Some corruption?
> > >
> > > - Looks like you are using a UP second kernel. You can try building second
> > > kernel as SMP kernel and pass maxcpus=1 option while loading the second
> > > kernel using kexec -p.
> > >
> > > kexec -p /boot/vmlinuz-2.6.18-kdump --args-linux --console-serial
> > > --append="root=/dev/sda3 init 3 irqpoll console=ttyS0,115200,
> > > earlyprintk=ttyS0,115200 maxcpus=1"
> > >
> > > This will give some idea whether this problem exists with second kernels
> > > being SMP.
> >
> > Thank you, this kernel booted. :)
> >
>
> Excellent.
>
> Going through the logs you uploaded, I think you can't boot a UP kernel
> on your machine at all. So can you please compile your second kernel with
> CONFIG_PHYSICAL_ADDR=0x100000 (1MB) and then try to boot it through
> your boot loader (i think lilo). I think it will fail at the same place.
>
> And reason for that seems to be becaues for UP kernels NR_IRQ_VECTORS
> is defined as 32*NR_CPUS. So for UP kernel it is 32 and we are trying
> to use gsi/irq higher than that (38).
>
> GSI 38 sharing vector 0xB9 and IRQ 38
> GSI 48 sharing vector 0xC1 and IRQ 48
> GSI 49 sharing vector 0xC9 and IRQ 49
>
> I am not sure why I can't reproduce this problem. I am still looking
> into it.
I just tried 2.6.19-rc6, and it will boot UP as either a first or second
kernel. The issue must have been resolved in this release because I had
tried 2.6.19-rc5 UP previously (as a second kernel) and it did not boot.
Thanks,
Judith
>
> If you can't boot UP kernel through lilo, can you report this issue
> to LKML. Somebody knowing this code more can give it a thought.
>
> Thanks
> Vivek
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