sparseirq: Change irq_desc_ptrs to static

Add replace_irq_desc() instead of poking at the array directly.

-v2: remove unneeded boundary check in replace_irq_desc

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-31-git-send-email-yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 0e823c0..266f798 100644 (file)
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -127,7 +127,7 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
  */
 DEFINE_RAW_SPINLOCK(sparse_irq_lock);
 
-struct irq_desc **irq_desc_ptrs __read_mostly;
+static struct irq_desc **irq_desc_ptrs __read_mostly;
 
 static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
        [0 ... NR_IRQS_LEGACY-1] = {
@@ -192,6 +192,11 @@ struct irq_desc *irq_to_desc(unsigned int irq)
        return NULL;
 }
 
+void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
+{
+       irq_desc_ptrs[irq] = desc;
+}
+
 struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
 {
        struct irq_desc *desc;

diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index b2821f0..c63f3bc 100644 (file)
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -21,11 +21,7 @@ extern void clear_kstat_irqs(struct irq_desc *desc);
 extern raw_spinlock_t sparse_irq_lock;
 
 #ifdef CONFIG_SPARSE_IRQ
-/* irq_desc_ptrs allocated at boot time */
-extern struct irq_desc **irq_desc_ptrs;
-#else
-/* irq_desc_ptrs is a fixed size array */
-extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
+void replace_irq_desc(unsigned int irq, struct irq_desc *desc);
 #endif
 
 #ifdef CONFIG_PROC_FS

diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 26bac9d..963559d 100644 (file)
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -70,7 +70,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
        raw_spin_lock_irqsave(&sparse_irq_lock, flags);
 
        /* We have to check it to avoid races with another CPU */
-       desc = irq_desc_ptrs[irq];
+       desc = irq_to_desc(irq);
 
        if (desc && old_desc != desc)
                goto out_unlock;
@@ -90,7 +90,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
                goto out_unlock;
        }
 
-       irq_desc_ptrs[irq] = desc;
+       replace_irq_desc(irq, desc);
        raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
 
        /* free the old one */