Re: [PATCH -mm] kexec jump -v9

On Thu, 2008-05-15 at 18:35 -0700, Eric W. Biederman wrote:
Vivek Goyal <vgoyal@xxxxxxxxxx> writes:

ioapic_suspend() is not putting APICs in Legacy mode and that's why
we are seeing the issue. It only saves the IOAPIC routing table entries
and these entries are restored during ioapic_resume().

But I think somebody has to put APICs in legacy mode for normal
hibernation also. Not sure who does it. May be BIOS, so that during
resume, second kernel can get the timer interrupts.

I doubt anything cares in the suspend to ram case. There should just
be a small BIOS trampoline to get back to linux when the processor
restarts. And you don't need interrupts for any of that.

As far as I know, in suspend to ram, interrupt is used as waking up
event, such as, keyboard interrupt.

Best Regards,
Huang Ying
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