lkml.org 
[lkml]   [2010]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 3/5] sparseirq: change irq_desc_ptrs to static
add replace_irq_desc()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
kernel/irq/handle.c | 8 +++++++-
kernel/irq/internals.h | 6 +-----
kernel/irq/numa_migrate.c | 4 ++--
3 files changed, 10 insertions(+), 8 deletions(-)
Index: linux-2.6/kernel/irq/handle.c
===================================================================
--- linux-2.6.orig/kernel/irq/handle.c
+++ linux-2.6/kernel/irq/handle.c
@@ -127,7 +127,7 @@ static void init_one_irq_desc(int irq, s
*/
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 +192,12 @@ struct irq_desc *irq_to_desc(unsigned in
return NULL;
}

+void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
+{
+ if (irq_desc_ptrs && irq < nr_irqs)
+ irq_desc_ptrs[irq] = desc;
+}
+
struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
{
struct irq_desc *desc;
Index: linux-2.6/kernel/irq/internals.h
===================================================================
--- linux-2.6.orig/kernel/irq/internals.h
+++ linux-2.6/kernel/irq/internals.h
@@ -21,11 +21,7 @@ extern void clear_kstat_irqs(struct irq_
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
Index: linux-2.6/kernel/irq/numa_migrate.c
===================================================================
--- linux-2.6.orig/kernel/irq/numa_migrate.c
+++ linux-2.6/kernel/irq/numa_migrate.c
@@ -70,7 +70,7 @@ static struct irq_desc *__real_move_irq_
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_
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 */

\
 
 \ /
  Last update: 2010-01-08 12:57    [from the cache]
©2003-2011 Jasper Spaans