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>
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d5a4333..b5943e9 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -31,7 +31,7 @@
*/
void synchronize_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned int status;
if (irq >= nr_irqs)
@@ -64,7 +64,7 @@
*/
int irq_can_set_affinity(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
!desc->chip->set_affinity)
@@ -81,7 +81,7 @@
*/
int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (!desc->chip->set_affinity)
return -EINVAL;
@@ -111,14 +111,16 @@
int irq_select_affinity(unsigned int irq)
{
cpumask_t mask;
+ struct irq_desc *desc;
if (!irq_can_set_affinity(irq))
return 0;
cpus_and(mask, cpu_online_map, irq_default_affinity);
- irq_desc[irq].affinity = mask;
- irq_desc[irq].chip->set_affinity(irq, mask);
+ desc = irq_to_desc(irq);
+ desc->affinity = mask;
+ desc->chip->set_affinity(irq, mask);
set_balance_irq_affinity(irq, mask);
return 0;
@@ -140,7 +142,7 @@
*/
void disable_irq_nosync(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
if (irq >= nr_irqs)
@@ -169,7 +171,7 @@
*/
void disable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (irq >= nr_irqs)
return;
@@ -211,7 +213,7 @@
*/
void enable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
if (irq >= nr_irqs)
@@ -225,7 +227,7 @@
static int set_irq_wake_real(unsigned int irq, unsigned int on)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
int ret = -ENXIO;
if (desc->chip->set_wake)
@@ -248,7 +250,7 @@
*/
int set_irq_wake(unsigned int irq, unsigned int on)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
int ret = 0;
@@ -288,12 +290,13 @@
*/
int can_request_irq(unsigned int irq, unsigned long irqflags)
{
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
- if (irq >= nr_irqs || irq_desc[irq].status & IRQ_NOREQUEST)
+ if (irq >= nr_irqs || desc->status & IRQ_NOREQUEST)
return 0;
- action = irq_desc[irq].action;
+ action = desc->action;
if (action)
if (irqflags & action->flags & IRQF_SHARED)
action = NULL;
@@ -349,7 +352,7 @@
*/
int setup_irq(unsigned int irq, struct irqaction *new)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *old, **p;
const char *old_name = NULL;
unsigned long flags;
@@ -518,7 +521,7 @@
if (irq >= nr_irqs)
return;
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
spin_lock_irqsave(&desc->lock, flags);
p = &desc->action;
for (;;) {
@@ -615,6 +618,7 @@
{
struct irqaction *action;
int retval;
+ struct irq_desc *desc;
#ifdef CONFIG_LOCKDEP
/*
@@ -632,7 +636,8 @@
return -EINVAL;
if (irq >= nr_irqs)
return -EINVAL;
- if (irq_desc[irq].status & IRQ_NOREQUEST)
+ desc = irq_to_desc(irq);
+ if (desc->status & IRQ_NOREQUEST)
return -EINVAL;
if (!handler)
return -EINVAL;
