xen: Use this_cpu_inc_return

__this_cpu_inc_return reduces code and simplifies code.

Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index a10c66dc9dda294003ed2ed36735a7b18d12dddf..65f8637d13cf1fa555825824d71c5a4c30e39828 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1109,7 +1109,7 @@ static void __xen_evtchn_do_upcall(void)
 
                vcpu_info->evtchn_upcall_pending = 0;
 
-               if (__get_cpu_var(xed_nesting_count)++)
+               if (__this_cpu_inc_return(xed_nesting_count) - 1)
                        goto out;
 
 #ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */