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@xxxxxxxxxxxxx>
---
include/linux/irq.h | 6 ++++++
kernel/irq/chip.c | 2 +-
kernel/irq/irqdesc.c | 6 +++---
3 files changed, 10 insertions(+), 4 deletions(-)
Index: linux-2.6-tip/include/linux/irq.h
===================================================================
--- linux-2.6-tip.orig/include/linux/irq.h
+++ linux-2.6-tip/include/linux/irq.h
@@ -281,6 +281,12 @@ extern struct irq_desc *irq_to_desc_allo
*/
#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)
+
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern void remove_irq(unsigned int irq, struct irqaction *act);
Index: linux-2.6-tip/kernel/irq/chip.c
===================================================================
--- linux-2.6-tip.orig/kernel/irq/chip.c
+++ linux-2.6-tip/kernel/irq/chip.c
@@ -31,7 +31,7 @@ static void dynamic_irq_init_x(unsigned
/* 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->chip = &no_irq_chip;
desc->irq_data.chip = &no_irq_chip;
desc->handle_irq = handle_bad_irq;
Index: linux-2.6-tip/kernel/irq/irqdesc.c
===================================================================
--- linux-2.6-tip.orig/kernel/irq/irqdesc.c
+++ linux-2.6-tip/kernel/irq/irqdesc.c
@@ -40,7 +40,7 @@ EXPORT_SYMBOL_GPL(nr_irqs);
static struct irq_desc irq_desc_init = {
.irq = -1,
- .status = IRQ_DISABLED,
+ .status = IRQ_DEFAULT_INIT_FLAGS,
.chip = &no_irq_chip,
.handle_irq = handle_bad_irq,
.depth = 1,
@@ -119,7 +119,7 @@ void replace_irq_desc(unsigned int irq,
static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS_LEGACY-1] = {
.irq = -1,
- .status = IRQ_DISABLED,
+ .status = IRQ_DEFAULT_INIT_FLAGS,
.chip = &no_irq_chip,
.handle_irq = handle_bad_irq,
.depth = 1,
@@ -211,7 +211,7 @@ 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,
.chip = &no_irq_chip,
.handle_irq = handle_bad_irq,
.depth = 1,
--
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