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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>
This commit is contained in:
Yinghai Lu 2010-02-10 01:20:34 -08:00 committed by H. Peter Anvin
parent 773e3eb7b8
commit 99558f0bbe
3 changed files with 9 additions and 8 deletions
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7
kernel/irq/handle.c
View File

@ -127,7 +127,7 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
*/ */
DEFINE_RAW_SPINLOCK(sparse_irq_lock); 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 = { static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS_LEGACY-1] = { [0 ... NR_IRQS_LEGACY-1] = {
@ -192,6 +192,11 @@ struct irq_desc *irq_to_desc(unsigned int irq)
return NULL; 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 * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
{ {
struct irq_desc *desc; struct irq_desc *desc;

6
kernel/irq/internals.h
View File

@ -21,11 +21,7 @@ extern void clear_kstat_irqs(struct irq_desc *desc);
extern raw_spinlock_t sparse_irq_lock; extern raw_spinlock_t sparse_irq_lock;
#ifdef CONFIG_SPARSE_IRQ #ifdef CONFIG_SPARSE_IRQ
/* irq_desc_ptrs allocated at boot time */ void replace_irq_desc(unsigned int irq, struct irq_desc *desc);
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];
#endif #endif
#ifdef CONFIG_PROC_FS #ifdef CONFIG_PROC_FS

4
kernel/irq/numa_migrate.c
View File

@ -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); raw_spin_lock_irqsave(&sparse_irq_lock, flags);
/* We have to check it to avoid races with another CPU */ /* 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) if (desc && old_desc != desc)
goto out_unlock; goto out_unlock;
@ -90,7 +90,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
goto out_unlock; goto out_unlock;
} }
irq_desc_ptrs[irq] = desc; replace_irq_desc(irq, desc);
raw_spin_unlock_irqrestore(&sparse_irq_lock, flags); raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
/* free the old one */ /* free the old one */