[src/trunk]: src/sys/arch/xen/x86 Optimise branch predict hint for the intend...

[cherry <cherry%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/29a568098f35
branches:  trunk
changeset: 772271:29a568098f35
user:      cherry <cherry%NetBSD.org@localhost>
date:      Tue Dec 27 07:47:00 2011 +0000

description:
Optimise branch predict hint for the intended use-case (cross cpu event notification)

diffstat:

 sys/arch/xen/x86/hypervisor_machdep.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 4dc239ae130a -r 29a568098f35 sys/arch/xen/x86/hypervisor_machdep.c
--- a/sys/arch/xen/x86/hypervisor_machdep.c     Tue Dec 27 07:45:41 2011 +0000
+++ b/sys/arch/xen/x86/hypervisor_machdep.c     Tue Dec 27 07:47:00 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: hypervisor_machdep.c,v 1.20 2011/12/27 07:45:41 cherry Exp $   */
+/*     $NetBSD: hypervisor_machdep.c,v 1.21 2011/12/27 07:47:00 cherry Exp $   */
 
 /*
  *
@@ -54,7 +54,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: hypervisor_machdep.c,v 1.20 2011/12/27 07:45:41 cherry Exp $");
+__KERNEL_RCSID(0, "$NetBSD: hypervisor_machdep.c,v 1.21 2011/12/27 07:47:00 cherry Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -296,7 +296,7 @@
 
        xen_atomic_set_bit(&s->evtchn_pending[0], ev);
 
-       if (__predict_true(ci == curcpu())) {
+       if (__predict_false(ci == curcpu())) {
                xen_atomic_set_bit(&vci->evtchn_pending_sel,
                    ev >> LONG_SHIFT);
                xen_atomic_set_bit(&vci->evtchn_upcall_pending, 0);