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generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]

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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>
This commit is contained in:
Yinghai Lu
2008-08-19 20:50:05 -07:00
committed by Ingo Molnar
parent bfea1238be
commit 08678b0841
28 changed files with 405 additions and 188 deletions
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32
include/linux/irq.h
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@@ -152,6 +152,10 @@ struct irq_chip {
* @name: flow handler name for /proc/interrupts output
*/
struct irq_desc {
unsigned int irq;
#ifdef CONFIG_HAVE_SPARSE_IRQ
struct irq_desc *next;
#endif
irq_flow_handler_t handle_irq;
struct irq_chip *chip;
struct msi_desc *msi_desc;
@@ -179,9 +183,9 @@ struct irq_desc {
const char *name;
} ____cacheline_internodealigned_in_smp;
#ifdef CONFIG_HAVE_DYN_ARRAY
extern struct irq_desc *irq_desc;
#else
extern struct irq_desc *irq_to_desc(unsigned int irq);
#ifndef CONFIG_HAVE_DYN_ARRAY
/* could be removed if we get rid of all irq_desc reference */
extern struct irq_desc irq_desc[NR_IRQS];
#endif
@@ -249,7 +253,10 @@ extern int no_irq_affinity;
static inline int irq_balancing_disabled(unsigned int irq)
{
return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
struct irq_desc *desc;
desc = irq_to_desc(irq);
return desc->status & IRQ_NO_BALANCING_MASK;
}
/* Handle irq action chains: */
@@ -281,7 +288,7 @@ extern unsigned int __do_IRQ(unsigned int irq);
*/
static inline void generic_handle_irq(unsigned int irq)
{
struct irq_desc *desc = irq_desc + irq;
struct irq_desc *desc = irq_to_desc(irq);
#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
desc->handle_irq(irq, desc);
@@ -325,7 +332,10 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
static inline void __set_irq_handler_unlocked(int irq,
irq_flow_handler_t handler)
{
irq_desc[irq].handle_irq = handler;
struct irq_desc *desc;
desc = irq_to_desc(irq);
desc->handle_irq = handler;
}
/*
@@ -359,7 +369,7 @@ extern void destroy_irq(unsigned int irq);
/* Test to see if a driver has successfully requested an irq */
static inline int irq_has_action(unsigned int irq)
{
struct irq_desc *desc = irq_desc + irq;
struct irq_desc *desc = irq_to_desc(irq);
return desc->action != NULL;
}
@@ -374,10 +384,10 @@ extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
#define get_irq_chip(irq) (irq_desc[irq].chip)
#define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
#define get_irq_data(irq) (irq_desc[irq].handler_data)
#define get_irq_msi(irq) (irq_desc[irq].msi_desc)
#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
#endif /* CONFIG_GENERIC_HARDIRQS */