[PATCH 13/15] xen/multicalls: add unlikely around slowpath in __xen_mc_entry()

Jeremy Fitzhardinge
2011-06-20T22:15:38Z

arch/x86/xen/multicalls.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index f19e43b..b9b9811 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -123,8 +123,8 @@ struct multicall_space __xen_mc_entry(size_t args)
BUG_ON(preemptible());
BUG_ON(b->argidx > MC_ARGS);

- if (b->mcidx == MC_BATCH ||
- (argidx + args) > MC_ARGS) {
+ if (unlikely(b->mcidx == MC_BATCH ||
+ (argidx + args) > MC_ARGS)) {
trace_xen_mc_flush_reason((b->mcidx == MC_BATCH) ?
XEN_MC_FL_BATCH : XEN_MC_FL_ARGS);
xen_mc_flush();
--
1.7.5.4