7 files changed, 69 insertions, 77 deletions

diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 3394f8f52964..7d047808419d 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -3,5 +3,5 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
-obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
+obj-$(CONFIG_NUMA_IRQ_DESC) += numa_migrate.o
 obj-$(CONFIG_PM_SLEEP) += pm.o
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index c687ba4363f2..13c68e71b726 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -359,7 +359,6 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
 
         spin_lock(&desc->lock);
         mask_ack_irq(desc, irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         if (unlikely(desc->status & IRQ_INPROGRESS))
                 goto out_unlock;
@@ -438,7 +437,6 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
         desc->status &= ~IRQ_INPROGRESS;
 out:
         desc->chip->eoi(irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         spin_unlock(&desc->lock);
 }
@@ -475,7 +473,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
                     !desc->action)) {
                 desc->status |= (IRQ_PENDING | IRQ_MASKED);
                 mask_ack_irq(desc, irq);
-                desc = irq_remap_to_desc(irq, desc);
                 goto out_unlock;
         }
         kstat_incr_irqs_this_cpu(irq, desc);
@@ -483,7 +480,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
         /* Start handling the irq */
         if (desc->chip->ack)
                 desc->chip->ack(irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         /* Mark the IRQ currently in progress.*/
         desc->status |= IRQ_INPROGRESS;
@@ -544,10 +540,8 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
         if (!noirqdebug)
                 note_interrupt(irq, desc, action_ret);
 
-        if (desc->chip->eoi) {
+        if (desc->chip->eoi)
                 desc->chip->eoi(irq);
-                desc = irq_remap_to_desc(irq, desc);
-        }
 }
 
 void
@@ -582,10 +576,8 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 
         /* Uninstall? */
         if (handle == handle_bad_irq) {
-                if (desc->chip != &no_irq_chip) {
+                if (desc->chip != &no_irq_chip)
                         mask_ack_irq(desc, irq);
-                        desc = irq_remap_to_desc(irq, desc);
-                }
                 desc->status |= IRQ_DISABLED;
                 desc->depth = 1;
         }
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 26e08754744f..18041a254d32 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -11,6 +11,7 @@
  */
 
 #include <linux/irq.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/interrupt.h>
@@ -81,45 +82,48 @@ static struct irq_desc irq_desc_init = {
         .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
 };
 
-void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
+void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
 {
-        int node;
         void *ptr;
 
-        node = cpu_to_node(cpu);
-        ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs), GFP_ATOMIC, node);
+        if (slab_is_available())
+                ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
+                                   GFP_ATOMIC, node);
+        else
+                ptr = alloc_bootmem_node(NODE_DATA(node),
+                                nr * sizeof(*desc->kstat_irqs));
 
         /*
          * don't overwite if can not get new one
          * init_copy_kstat_irqs() could still use old one
          */
         if (ptr) {
-                printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n",
-                         cpu, node);
+                printk(KERN_DEBUG "  alloc kstat_irqs on node %d\n", node);
                 desc->kstat_irqs = ptr;
         }
 }
 
-static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
+static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
 {
         memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
 
         spin_lock_init(&desc->lock);
         desc->irq = irq;
 #ifdef CONFIG_SMP
-        desc->cpu = cpu;
+        desc->node = node;
 #endif
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        init_kstat_irqs(desc, cpu, nr_cpu_ids);
+        init_kstat_irqs(desc, node, nr_cpu_ids);
         if (!desc->kstat_irqs) {
                 printk(KERN_ERR "can not alloc kstat_irqs\n");
                 BUG_ON(1);
         }
-        if (!init_alloc_desc_masks(desc, cpu, false)) {
+        if (!alloc_desc_masks(desc, node, false)) {
                 printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
                 BUG_ON(1);
         }
-        arch_init_chip_data(desc, cpu);
+        init_desc_masks(desc);
+        arch_init_chip_data(desc, node);
 }
 
 /*
@@ -169,7 +173,8 @@ int __init early_irq_init(void)
                 desc[i].irq = i;
                 desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
-                init_alloc_desc_masks(&desc[i], 0, true);
+                alloc_desc_masks(&desc[i], 0, true);
+                init_desc_masks(&desc[i]);
                 irq_desc_ptrs[i] = desc + i;
         }
 
@@ -187,11 +192,10 @@ struct irq_desc *irq_to_desc(unsigned int irq)
         return NULL;
 }
 
-struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
 {
         struct irq_desc *desc;
         unsigned long flags;
-        int node;
 
         if (irq >= nr_irqs) {
                 WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
@@ -210,15 +214,17 @@ struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
         if (desc)
                 goto out_unlock;
 
-        node = cpu_to_node(cpu);
-        desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
-        printk(KERN_DEBUG "  alloc irq_desc for %d on cpu %d node %d\n",
-                 irq, cpu, node);
+        if (slab_is_available())
+                desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+        else
+                desc = alloc_bootmem_node(NODE_DATA(node), sizeof(*desc));
+
+        printk(KERN_DEBUG "  alloc irq_desc for %d on node %d\n", irq, node);
         if (!desc) {
                 printk(KERN_ERR "can not alloc irq_desc\n");
                 BUG_ON(1);
         }
-        init_one_irq_desc(irq, desc, cpu);
+        init_one_irq_desc(irq, desc, node);
 
         irq_desc_ptrs[irq] = desc;
 
@@ -256,7 +262,8 @@ int __init early_irq_init(void)
 
         for (i = 0; i < count; i++) {
                 desc[i].irq = i;
-                init_alloc_desc_masks(&desc[i], 0, true);
+                alloc_desc_masks(&desc[i], 0, true);
+                init_desc_masks(&desc[i]);
                 desc[i].kstat_irqs = kstat_irqs_all[i];
         }
         return arch_early_irq_init();
@@ -267,7 +274,7 @@ struct irq_desc *irq_to_desc(unsigned int irq)
         return (irq < NR_IRQS) ? irq_desc + irq : NULL;
 }
 
-struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
 {
         return irq_to_desc(irq);
 }
@@ -453,11 +460,8 @@ unsigned int __do_IRQ(unsigned int irq)
                 /*
                  * No locking required for CPU-local interrupts:
                  */
-                if (desc->chip->ack) {
+                if (desc->chip->ack)
                         desc->chip->ack(irq);
-                        /* get new one */
-                        desc = irq_remap_to_desc(irq, desc);
-                }
                 if (likely(!(desc->status & IRQ_DISABLED))) {
                         action_ret = handle_IRQ_event(irq, desc->action);
                         if (!noirqdebug)
@@ -468,10 +472,8 @@ unsigned int __do_IRQ(unsigned int irq)
         }
 
         spin_lock(&desc->lock);
-        if (desc->chip->ack) {
+        if (desc->chip->ack)
                 desc->chip->ack(irq);
-                desc = irq_remap_to_desc(irq, desc);
-        }
         /*
          * REPLAY is when Linux resends an IRQ that was dropped earlier
          * WAITING is used by probe to mark irqs that are being tested
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 01ce20eab38f..73468253143b 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -16,7 +16,7 @@ extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
 
 extern struct lock_class_key irq_desc_lock_class;
-extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
+extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
 extern void clear_kstat_irqs(struct irq_desc *desc);
 extern spinlock_t sparse_irq_lock;
 
@@ -42,6 +42,9 @@ static inline void unregister_handler_proc(unsigned int irq,
 
 extern int irq_select_affinity_usr(unsigned int irq);
 
+extern void
+irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask);
+
 /*
  * Debugging printout:
  */
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 2734eca59243..aaf5c9d05770 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -80,7 +80,7 @@ int irq_can_set_affinity(unsigned int irq)
         return 1;
 }
 
-static void
+void
 irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask)
 {
         struct irqaction *action = desc->action;
@@ -109,17 +109,22 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
         spin_lock_irqsave(&desc->lock, flags);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
-        if (desc->status & IRQ_MOVE_PCNTXT)
-                desc->chip->set_affinity(irq, cpumask);
+        if (desc->status & IRQ_MOVE_PCNTXT) {
+                if (!desc->chip->set_affinity(irq, cpumask)) {
+                        cpumask_copy(desc->affinity, cpumask);
+                        irq_set_thread_affinity(desc, cpumask);
+                }
+        }
         else {
                 desc->status |= IRQ_MOVE_PENDING;
                 cpumask_copy(desc->pending_mask, cpumask);
         }
 #else
-        cpumask_copy(desc->affinity, cpumask);
-        desc->chip->set_affinity(irq, cpumask);
+        if (!desc->chip->set_affinity(irq, cpumask)) {
+                cpumask_copy(desc->affinity, cpumask);
+                irq_set_thread_affinity(desc, cpumask);
+        }
 #endif
-        irq_set_thread_affinity(desc, cpumask);
         desc->status |= IRQ_AFFINITY_SET;
         spin_unlock_irqrestore(&desc->lock, flags);
         return 0;
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index e05ad9be43b7..cfe767ca1545 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -1,5 +1,8 @@
 
 #include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
 
 void move_masked_irq(int irq)
 {
@@ -39,11 +42,12 @@ void move_masked_irq(int irq)
          * masking the irqs.
          */
         if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-                   < nr_cpu_ids)) {
-                cpumask_and(desc->affinity,
-                            desc->pending_mask, cpu_online_mask);
-                desc->chip->set_affinity(irq, desc->affinity);
-        }
+                   < nr_cpu_ids))
+                if (!desc->chip->set_affinity(irq, desc->pending_mask)) {
+                        cpumask_copy(desc->affinity, desc->pending_mask);
+                        irq_set_thread_affinity(desc, desc->pending_mask);
+                }
+
         cpumask_clear(desc->pending_mask);
 }
 
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 44bbdcbaf8d2..2f69bee57bf2 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -15,9 +15,9 @@
 
 static void init_copy_kstat_irqs(struct irq_desc *old_desc,
                                  struct irq_desc *desc,
-                                 int cpu, int nr)
+                                 int node, int nr)
 {
-        init_kstat_irqs(desc, cpu, nr);
+        init_kstat_irqs(desc, node, nr);
 
         if (desc->kstat_irqs != old_desc->kstat_irqs)
                 memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
@@ -34,20 +34,20 @@ static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
 }
 
 static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
-                 struct irq_desc *desc, int cpu)
+                 struct irq_desc *desc, int node)
 {
         memcpy(desc, old_desc, sizeof(struct irq_desc));
-        if (!init_alloc_desc_masks(desc, cpu, false)) {
+        if (!alloc_desc_masks(desc, node, false)) {
                 printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
                                 "for migration.\n", irq);
                 return false;
         }
         spin_lock_init(&desc->lock);
-        desc->cpu = cpu;
+        desc->node = node;
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+        init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids);
         init_copy_desc_masks(old_desc, desc);
-        arch_init_copy_chip_data(old_desc, desc, cpu);
+        arch_init_copy_chip_data(old_desc, desc, node);
         return true;
 }
 
@@ -59,12 +59,11 @@ static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
 }
 
 static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
-                                                int cpu)
+                                                int node)
 {
         struct irq_desc *desc;
         unsigned int irq;
         unsigned long flags;
-        int node;
 
         irq = old_desc->irq;
 
@@ -76,7 +75,6 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
         if (desc && old_desc != desc)
                 goto out_unlock;
 
-        node = cpu_to_node(cpu);
         desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
         if (!desc) {
                 printk(KERN_ERR "irq %d: can not get new irq_desc "
@@ -85,7 +83,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
                 desc = old_desc;
                 goto out_unlock;
         }
-        if (!init_copy_one_irq_desc(irq, old_desc, desc, cpu)) {
+        if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) {
                 /* still use old one */
                 kfree(desc);
                 desc = old_desc;
@@ -97,9 +95,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
 
         /* free the old one */
         free_one_irq_desc(old_desc, desc);
-        spin_unlock(&old_desc->lock);
         kfree(old_desc);
-        spin_lock(&desc->lock);
 
         return desc;
 
@@ -109,24 +105,14 @@ out_unlock:
         return desc;
 }
 
-struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
+struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 {
-        int old_cpu;
-        int node, old_node;
-
         /* those all static, do move them */
         if (desc->irq < NR_IRQS_LEGACY)
                 return desc;
 
-        old_cpu = desc->cpu;
-        if (old_cpu != cpu) {
-                node = cpu_to_node(cpu);
-                old_node = cpu_to_node(old_cpu);
-                if (old_node != node)
-                        desc = __real_move_irq_desc(desc, cpu);
-                else
-                        desc->cpu = cpu;
-        }
+        if (desc->node != node)
+                desc = __real_move_irq_desc(desc, node);
 
         return desc;
 }