redonkable/alistair23-linux
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genirq: Provide default irq init flags

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Arch code sets it's own irq_desc.status flags right after boot and for
dynamically allocated interrupts. That might involve iterating over a
huge array.

Allow ARCH_IRQ_INIT_FLAGS to set separate flags aside of IRQ_DISABLED
which is the default.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2010-09-27 21:01:37 +02:00
parent d895f51ebb
commit 1318a481fc
3 changed files with 10 additions and 4 deletions
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6
include/linux/irq.h
View file

@ -214,6 +214,12 @@ struct irq_chip {
*/
#include <asm/hw_irq.h>
#ifndef ARCH_IRQ_INIT_FLAGS
# define ARCH_IRQ_INIT_FLAGS 0
#endif
#define IRQ_DEFAULT_INIT_FLAGS (IRQ_DISABLED | ARCH_IRQ_INIT_FLAGS)
struct irqaction;
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern void remove_irq(unsigned int irq, struct irqaction *act);

2
kernel/irq/chip.c
View file

@ -31,7 +31,7 @@ static void dynamic_irq_init_x(unsigned int irq, bool keep_chip_data)
/* Ensure we don't have left over values from a previous use of this irq */
raw_spin_lock_irqsave(&desc->lock, flags);
desc->status = IRQ_DISABLED;
desc->status = IRQ_DEFAULT_INIT_FLAGS;
desc->irq_data.chip = &no_irq_chip;
desc->handle_irq = handle_bad_irq;
desc->depth = 1;

6
kernel/irq/irqdesc.c
View file

@ -39,7 +39,7 @@ EXPORT_SYMBOL_GPL(nr_irqs);
#ifdef CONFIG_SPARSE_IRQ
static struct irq_desc irq_desc_init = {
.status = IRQ_DISABLED,
.status = IRQ_DEFAULT_INIT_FLAGS,
.handle_irq = handle_bad_irq,
.depth = 1,
.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
@ -113,7 +113,7 @@ void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS_LEGACY-1] = {
.status = IRQ_DISABLED,
.status = IRQ_DEFAULT_INIT_FLAGS,
.handle_irq = handle_bad_irq,
.depth = 1,
.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
@ -204,7 +204,7 @@ out_unlock:
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
.status = IRQ_DEFAULT_INIT_FLAGS,
.handle_irq = handle_bad_irq,
.depth = 1,
.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),