tree fc6afc967e3c321c703d1278761d351cf9733e64
parent bd7f561f76563f0b21701628874d8adc863b0c25
author Suresh Warrier <warrier@linux.vnet.ibm.com> 1450385944 -0600
committer Paul Mackerras <paulus@samba.org> 1456723506 +1100

powerpc/smp: Add smp_muxed_ipi_set_message

smp_muxed_ipi_message_pass() invokes smp_ops->cause_ipi, which
uses an ioremapped address to access registers on the XICS
interrupt controller to cause the IPI. Because of this real
mode callers cannot call smp_muxed_ipi_message_pass() for IPI
messaging.

This patch creates a separate function smp_muxed_ipi_set_message
just to set the IPI message without the cause_ipi routine.
After calling this function to set the IPI message, real
mode callers must cause the IPI by writing to the XICS registers
directly.

As part of this, we also change smp_muxed_ipi_message_pass
to call smp_muxed_ipi_set_message to set the message instead
of doing it directly inside the routine.

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>