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| author | Paul Mackerras <paulus@samba.org> | 2011-05-25 23:34:12 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-06-20 11:21:32 +1000 |
| commit | 9ca980dce523760ce04a798470d36fd5aa596b78 (patch) | |
| tree | bef37cf5113f56a8e77d6bebf2f57a9df9ae8c21 /arch/powerpc/platforms/wsp | |
| parent | 7ac87abb8166b99584149fcfb2efef5773a078e9 (diff) | |
| download | blackbird-op-linux-9ca980dce523760ce04a798470d36fd5aa596b78.tar.gz blackbird-op-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/wsp')
| -rw-r--r-- | arch/powerpc/platforms/wsp/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/wsp/smp.c b/arch/powerpc/platforms/wsp/smp.c index 9d20fa9d3710..71bd105f3863 100644 --- a/arch/powerpc/platforms/wsp/smp.c +++ b/arch/powerpc/platforms/wsp/smp.c @@ -75,7 +75,7 @@ static int __init smp_a2_probe(void) } static struct smp_ops_t a2_smp_ops = { - .message_pass = smp_muxed_ipi_message_pass, + .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = doorbell_cause_ipi, .probe = smp_a2_probe, .kick_cpu = smp_a2_kick_cpu, |
