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authorYinghai Lu <yhlu.kernel@gmail.com>2008-08-19 20:50:05 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-16 16:52:29 +0200
commit08678b0841267c1d00d771fe01548d86043d065e (patch)
tree7debb21f9e9a768ced43077f7376797a0c46f8c0 /kernel/irq/chip.c
parentbfea1238beac9d306eeac081c67de5ca6aec4c7a (diff)
downloadlinux-08678b0841267c1d00d771fe01548d86043d065e.tar.bz2
generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]
add CONFIG_HAVE_SPARSE_IRQ to for use condensed array. Get rid of irq_desc[] array assumptions. Preallocate 32 irq_desc, and irq_desc() will try to get more. ( No change in functionality is expected anywhere, except the odd build failure where we missed a code site or where a crossing commit itroduces new irq_desc[] usage. ) v2: according to Eric, change get_irq_desc() to irq_desc() Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq/chip.c')
-rw-r--r--kernel/irq/chip.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index bba66e098703..76c225cf4b26 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -33,7 +33,7 @@ void dynamic_irq_init(unsigned int irq)
}
/* Ensure we don't have left over values from a previous use of this irq */
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->status = IRQ_DISABLED;
desc->chip = &no_irq_chip;
@@ -65,7 +65,7 @@ void dynamic_irq_cleanup(unsigned int irq)
return;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
if (desc->action) {
spin_unlock_irqrestore(&desc->lock, flags);
@@ -100,7 +100,7 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
if (!chip)
chip = &no_irq_chip;
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
irq_chip_set_defaults(chip);
desc->chip = chip;
@@ -126,7 +126,7 @@ int set_irq_type(unsigned int irq, unsigned int type)
return -ENODEV;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
if (type == IRQ_TYPE_NONE)
return 0;
@@ -155,7 +155,7 @@ int set_irq_data(unsigned int irq, void *data)
return -EINVAL;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->handler_data = data;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -180,7 +180,7 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
"Trying to install msi data for IRQ%d\n", irq);
return -EINVAL;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->msi_desc = entry;
if (entry)
@@ -198,9 +198,10 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
*/
int set_irq_chip_data(unsigned int irq, void *data)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc;
unsigned long flags;
+ desc = irq_to_desc(irq);
if (irq >= nr_irqs || !desc->chip) {
printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
return -EINVAL;
@@ -219,8 +220,9 @@ EXPORT_SYMBOL(set_irq_chip_data);
*/
static void default_enable(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc;
+ desc = irq_to_desc(irq);
desc->chip->unmask(irq);
desc->status &= ~IRQ_MASKED;
}
@@ -237,7 +239,10 @@ static void default_disable(unsigned int irq)
*/
static unsigned int default_startup(unsigned int irq)
{
- irq_desc[irq].chip->enable(irq);
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ desc->chip->enable(irq);
return 0;
}
@@ -247,8 +252,9 @@ static unsigned int default_startup(unsigned int irq)
*/
static void default_shutdown(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc;
+ desc = irq_to_desc(irq);
desc->chip->mask(irq);
desc->status |= IRQ_MASKED;
}
@@ -551,7 +557,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
return;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
if (!handle)
handle = handle_bad_irq;
@@ -616,7 +622,7 @@ void __init set_irq_noprobe(unsigned int irq)
return;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->status |= IRQ_NOPROBE;
@@ -634,7 +640,7 @@ void __init set_irq_probe(unsigned int irq)
return;
}
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
desc->status &= ~IRQ_NOPROBE;