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authorPaul Mackerras <paulus@samba.org>2011-05-26 01:34:12 +0200
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-06-20 03:21:32 +0200
commit9ca980dce523760ce04a798470d36fd5aa596b78 (patch)
treebef37cf5113f56a8e77d6bebf2f57a9df9ae8c21 /arch/powerpc/platforms/pseries/smp.c
parentpowerpc: Fix early boot accounting of CPUs (diff)
downloadlinux-9ca980dce523760ce04a798470d36fd5aa596b78.tar.xz
linux-9ca980dce523760ce04a798470d36fd5aa596b78.zip
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/smp.c')
-rw-r--r--arch/powerpc/platforms/pseries/smp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index fbffd7e47ab8..84dafd33edc5 100644
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -207,7 +207,7 @@ static struct smp_ops_t pSeries_mpic_smp_ops = {
};
static struct smp_ops_t pSeries_xics_smp_ops = {
- .message_pass = smp_muxed_ipi_message_pass,
+ .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
.cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */
.probe = xics_smp_probe,
.kick_cpu = smp_pSeries_kick_cpu,