xen/multicalls: add unlikely around slowpath in __xen_mc_entry()

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 3001162c4bce..cc71f7cf1adc 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();