powerpc: Avoid extra indirect function call in sending IPIs
On many platforms (including pSeries), smp_ops->message_pass is always
smp_muxed_ipi_message_pass. This changes arch/powerpc/kernel/smp.c so
that if smp_ops->message_pass is NULL, it calls smp_muxed_ipi_message_pass
directly.
This means that a platform doesn't need to set both .message_pass and
.cause_ipi, only one of them. It is a slight performance improvement
in that it gets rid of an indirect function call at the expense of a
predictable conditional branch.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index db092d7..d15fca3 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -447,7 +447,7 @@
/* PowerSurge-style Macs */
struct smp_ops_t psurge_smp_ops = {
- .message_pass = smp_muxed_ipi_message_pass,
+ .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
.cause_ipi = smp_psurge_cause_ipi,
.probe = smp_psurge_probe,
.kick_cpu = smp_psurge_kick_cpu,