x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120614074954.GF3383@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/apic/apic.c

@@ -2127,19 +2127,19 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				   const struct cpumask *andmask,
 				   unsigned int *apicid)
 {
-	int cpu;
+	unsigned int cpu;
 
 	for_each_cpu_and(cpu, cpumask, andmask) {
 		if (cpumask_test_cpu(cpu, cpu_online_mask))
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 /*

arch/x86/kernel/apic/es7000_32.c

@@ -529,7 +529,7 @@ static inline int
 es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, uninitialized_var(apicid);
+	unsigned int cpu, uninitialized_var(apicid);
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.

arch/x86/kernel/apic/summit_32.c

@@ -267,7 +267,7 @@ static inline int
 summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, apicid = 0;
+	unsigned int cpu, apicid = 0;
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -274,7 +274,7 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			  const struct cpumask *andmask,
 			  unsigned int *apicid)
 {
-	int cpu;
+	int unsigned cpu;
 
 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
@@ -285,12 +285,12 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 			break;
 	}
 
-	if (likely((unsigned int)cpu < nr_cpu_ids)) {
+	if (likely(cpu < nr_cpu_ids)) {
 		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 		return 0;
-	} else {
-		return -EINVAL;
 	}
+
+	return -EINVAL;
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)