Merge branch 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sparseirq: move __weak symbols into separate compilation unit
  sparseirq: work around __weak alias bug
  sparseirq: fix hang with !SPARSE_IRQ
  sparseirq: set lock_class for legacy irq when sparse_irq is selected
  sparseirq: work around compiler optimizing away __weak functions
  sparseirq: fix desc->lock init
  sparseirq: do not printk when migrating IRQ descriptors
  sparseirq: remove duplicated arch_early_irq_init()
  irq: simplify for_each_irq_desc() usage
  proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c
  irq: for_each_irq_desc() move to irqnr.h
  hrtimer: remove #include <linux/irq.h>

6 files changed, 54 insertions, 42 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index bda9cb92427..eb2bfefa6dc 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -32,7 +32,6 @@
  */
 
 #include <linux/cpu.h>
-#include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/hrtimer.h>
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 650ce4102a6..cc0f7321b8c 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -40,9 +40,6 @@ unsigned long probe_irq_on(void)
          * flush such a longstanding irq before considering it as spurious.
          */
         for_each_irq_desc_reverse(i, desc) {
-                if (!desc)
-                        continue;
-
                 spin_lock_irq(&desc->lock);
                 if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
                         /*
@@ -71,9 +68,6 @@ unsigned long probe_irq_on(void)
          * happened in the previous stage, it may have masked itself)
          */
         for_each_irq_desc_reverse(i, desc) {
-                if (!desc)
-                        continue;
-
                 spin_lock_irq(&desc->lock);
                 if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
                         desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
@@ -92,9 +86,6 @@ unsigned long probe_irq_on(void)
          * Now filter out any obviously spurious interrupts
          */
         for_each_irq_desc(i, desc) {
-                if (!desc)
-                        continue;
-
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
@@ -133,9 +124,6 @@ unsigned int probe_irq_mask(unsigned long val)
         int i;
 
         for_each_irq_desc(i, desc) {
-                if (!desc)
-                        continue;
-
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
@@ -178,9 +166,6 @@ int probe_irq_off(unsigned long val)
         unsigned int status;
 
         for_each_irq_desc(i, desc) {
-                if (!desc)
-                        continue;
-
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 6492400cb50..c20db0be917 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -56,10 +56,6 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
-void __init __attribute__((weak)) arch_early_irq_init(void)
-{
-}
-
 #ifdef CONFIG_SPARSE_IRQ
 static struct irq_desc irq_desc_init = {
         .irq        = -1,
@@ -90,13 +86,11 @@ void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
                 desc->kstat_irqs = (unsigned int *)ptr;
 }
 
-void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
-{
-}
-
 static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
 {
         memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
+
+        spin_lock_init(&desc->lock);
         desc->irq = irq;
 #ifdef CONFIG_SMP
         desc->cpu = cpu;
@@ -134,7 +128,7 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm
 /* FIXME: use bootmem alloc ...*/
 static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
 
-void __init early_irq_init(void)
+int __init early_irq_init(void)
 {
         struct irq_desc *desc;
         int legacy_count;
@@ -146,6 +140,7 @@ void __init early_irq_init(void)
         for (i = 0; i < legacy_count; i++) {
                 desc[i].irq = i;
                 desc[i].kstat_irqs = kstat_irqs_legacy[i];
+                lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
 
                 irq_desc_ptrs[i] = desc + i;
         }
@@ -153,7 +148,7 @@ void __init early_irq_init(void)
         for (i = legacy_count; i < NR_IRQS; i++)
                 irq_desc_ptrs[i] = NULL;
 
-        arch_early_irq_init();
+        return arch_early_irq_init();
 }
 
 struct irq_desc *irq_to_desc(unsigned int irq)
@@ -203,7 +198,7 @@ out_unlock:
         return desc;
 }
 
-#else
+#else /* !CONFIG_SPARSE_IRQ */
 
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         [0 ... NR_IRQS-1] = {
@@ -218,7 +213,31 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         }
 };
 
-#endif
+int __init early_irq_init(void)
+{
+        struct irq_desc *desc;
+        int count;
+        int i;
+
+        desc = irq_desc;
+        count = ARRAY_SIZE(irq_desc);
+
+        for (i = 0; i < count; i++)
+                desc[i].irq = i;
+
+        return arch_early_irq_init();
+}
+
+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)
+{
+        return irq_to_desc(irq);
+}
+#endif /* !CONFIG_SPARSE_IRQ */
 
 /*
  * What should we do if we get a hw irq event on an illegal vector?
@@ -428,9 +447,6 @@ void early_init_irq_lock_class(void)
         int i;
 
         for_each_irq_desc(i, desc) {
-                if (!desc)
-                        continue;
-
                 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
         }
 }
@@ -439,7 +455,7 @@ void early_init_irq_lock_class(void)
 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
         struct irq_desc *desc = irq_to_desc(irq);
-        return desc->kstat_irqs[cpu];
+        return desc ? desc->kstat_irqs[cpu] : 0;
 }
 #endif
 EXPORT_SYMBOL(kstat_irqs_cpu);
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 089c3746358..ecf765c6a77 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -42,6 +42,7 @@ static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
                  struct irq_desc *desc, int cpu)
 {
         memcpy(desc, old_desc, sizeof(struct irq_desc));
+        spin_lock_init(&desc->lock);
         desc->cpu = cpu;
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
         init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
@@ -74,10 +75,8 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
 
         node = cpu_to_node(cpu);
         desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
-        printk(KERN_DEBUG "  move irq_desc for %d to cpu %d node %d\n",
-                 irq, cpu, node);
         if (!desc) {
-                printk(KERN_ERR "can not get new irq_desc for moving\n");
+                printk(KERN_ERR "irq %d: can not get new irq_desc for migration.\n", irq);
                 /* still use old one */
                 desc = old_desc;
                 goto out_unlock;
@@ -106,8 +105,6 @@ struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
                 return desc;
 
         old_cpu = desc->cpu;
-        printk(KERN_DEBUG
-                 "try to move irq_desc from cpu %d to %d\n", old_cpu, cpu);
         if (old_cpu != cpu) {
                 node = cpu_to_node(cpu);
                 old_node = cpu_to_node(old_cpu);
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 3738107531f..dd364c11e56 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -91,9 +91,6 @@ static int misrouted_irq(int irq)
         int i, ok = 0;
 
         for_each_irq_desc(i, desc) {
-                if (!desc)
-                        continue;
-
                 if (!i)
                          continue;
 
@@ -115,8 +112,6 @@ static void poll_spurious_irqs(unsigned long dummy)
         for_each_irq_desc(i, desc) {
                 unsigned int status;
 
-                if (!desc)
-                        continue;
                 if (!i)
                          continue;
 
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 466e75ce271..670c1eca47e 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -784,3 +784,23 @@ int on_each_cpu(void (*func) (void *info), void *info, int wait)
 }
 EXPORT_SYMBOL(on_each_cpu);
 #endif
+
+/*
+ * [ These __weak aliases are kept in a separate compilation unit, so that
+ *   GCC does not inline them incorrectly. ]
+ */
+
+int __init __weak early_irq_init(void)
+{
+        return 0;
+}
+
+int __init __weak arch_early_irq_init(void)
+{
+        return 0;
+}
+
+int __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
+{
+        return 0;
+}