x86: fixup_irqs() doesnt need an argument.

Impact: cleanup, remove on-stack cpumask.

The "map" arg is always cpu_online_mask.  Importantly, set_affinity
always ands the argument with cpu_online_mask anyway, so we don't need
to do it in fixup_irqs(), avoiding a temporary.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>

4 files changed, 17 insertions, 15 deletions

diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index bae0eda95486..8766d30fb746 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -37,7 +37,7 @@ extern int irqbalance_disable(char *str);
 
 #ifdef CONFIG_HOTPLUG_CPU
 #include <linux/cpumask.h>
-extern void fixup_irqs(cpumask_t map);
+extern void fixup_irqs(void);
 #endif
 
 extern unsigned int do_IRQ(struct pt_regs *regs);
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 9cf9cbbf7a02..9dc5588f336a 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -233,27 +233,28 @@ unsigned int do_IRQ(struct pt_regs *regs)
 #ifdef CONFIG_HOTPLUG_CPU
 #include <mach_apic.h>
 
-void fixup_irqs(cpumask_t map)
+/* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
+void fixup_irqs(void)
 {
         unsigned int irq;
         static int warned;
         struct irq_desc *desc;
 
         for_each_irq_desc(irq, desc) {
-                cpumask_t mask;
+                const struct cpumask *affinity;
 
                 if (!desc)
                         continue;
                 if (irq == 2)
                         continue;
 
-                cpus_and(mask, desc->affinity, map);
-                if (any_online_cpu(mask) == NR_CPUS) {
+                affinity = &desc->affinity;
+                if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
                         printk("Breaking affinity for irq %i\n", irq);
-                        mask = map;
+                        affinity = cpu_all_mask;
                 }
                 if (desc->chip->set_affinity)
-                        desc->chip->set_affinity(irq, &mask);
+                        desc->chip->set_affinity(irq, affinity);
                 else if (desc->action && !(warned++))
                         printk("Cannot set affinity for irq %i\n", irq);
         }
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 27f2307b0a34..fca2991443f5 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -83,16 +83,17 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-void fixup_irqs(cpumask_t map)
+/* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
+void fixup_irqs(void)
 {
         unsigned int irq;
         static int warned;
         struct irq_desc *desc;
 
         for_each_irq_desc(irq, desc) {
-                cpumask_t mask;
                 int break_affinity = 0;
                 int set_affinity = 1;
+                const struct cpumask *affinity;
 
                 if (!desc)
                         continue;
@@ -102,23 +103,23 @@ void fixup_irqs(cpumask_t map)
                 /* interrupt's are disabled at this point */
                 spin_lock(&desc->lock);
 
+                affinity = &desc->affinity;
                 if (!irq_has_action(irq) ||
-                    cpus_equal(desc->affinity, map)) {
+                    cpumask_equal(affinity, cpu_online_mask)) {
                         spin_unlock(&desc->lock);
                         continue;
                 }
 
-                cpus_and(mask, desc->affinity, map);
-                if (cpus_empty(mask)) {
+                if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
                         break_affinity = 1;
-                        mask = map;
+                        affinity = cpu_all_mask;
                 }
 
                 if (desc->chip->mask)
                         desc->chip->mask(irq);
 
                 if (desc->chip->set_affinity)
-                        desc->chip->set_affinity(irq, &mask);
+                        desc->chip->set_affinity(irq, affinity);
                 else if (!(warned++))
                         set_affinity = 0;
 
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 9d58134e0231..8b6f675b363b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1346,7 +1346,7 @@ void cpu_disable_common(void)
         lock_vector_lock();
         remove_cpu_from_maps(cpu);
         unlock_vector_lock();
-        fixup_irqs(cpu_online_map);
+        fixup_irqs();
 }
 
 int native_cpu_disable(void)