source: trunk/packages/xen-3.1/xen-3.1/patches/linux-2.6.18/git-5ee7737379b1d7f0c977c0f1661fbaf01a8d4721.patch @ 34

./arch/ia64/kernel/smp.c

@@ -328 +328 @@
 smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait)
 {
         struct call_data_struct data;
-        int cpus = num_online_cpus()-1;
+        int cpus;
 
-        if (!cpus)
+        spin_lock(&call_lock);
+        cpus = num_online_cpus()-1;
+        if (!cpus) {
+                spin_unlock(&call_lock);
                 return 0;
+        }
 
         /* Can deadlock when called with interrupts disabled */
         WARN_ON(irqs_disabled());
@@ -343 +347 @@
         if (wait)
                 atomic_set(&data.finished, 0);
 
-        spin_lock(&call_lock);
-
         call_data = &data;
         mb();   /* ensure store to call_data precedes setting of IPI_CALL_FUNC */
         send_IPI_allbutself(IPI_CALL_FUNC);