[PATCH 17/37] powerpc cell: use smp_request_message_ipi

[Milton Miller]

This is a request to merge patchwork id 3780 with the same subject.
I believe it was marked "changes requested" because it depended on a
patch that had requested changes, but those were resolved and this
one got overlooked.  The next patch will remove smp_msg_recv.

thanks,
milton

Here is the original change log:

Subject: [PATCH 15/16]  powerpc cell: use smp_request_message_ipi

cell native has 4 interrupts for ipis, so use the new smp_request_message_ipi
to save pathlength and the data-dependent branch.

This has the side effects of enabling the debugger ipi for kdump and
setting IRQF_PERCPU for the ipi interrupts.  It doesn't undo the virq
mapping if it turns out the ipi is not used.