genirq: Create irq_data
Low level chip functions need access to irq_desc->handler_data,
irq_desc->chip_data and irq_desc->msi_desc. We hand down the irq
number to the low level functions, so they need to lookup irq_desc.
With sparse irq this means a radix tree lookup.
We could hand down irq_desc itself, but low level chip functions have
no need to fiddle with it directly and we want to restrict access to
irq_desc further.
Preparatory patch for new chip functions.
Note, that the ugly anon union/struct is there to avoid a full tree
wide clean up for now. This is not going to last 3 years like __do_IRQ()
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20100927121841.645542300@linutronix.de>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 27e5c69..099d4fc 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -75,12 +75,10 @@
#ifdef CONFIG_SPARSE_IRQ
static struct irq_desc irq_desc_init = {
- .irq = -1,
- .status = IRQ_DISABLED,
- .chip = &no_irq_chip,
- .handle_irq = handle_bad_irq,
- .depth = 1,
- .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+ .status = IRQ_DISABLED,
+ .handle_irq = handle_bad_irq,
+ .depth = 1,
+ .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
};
void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
@@ -105,7 +103,7 @@
memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
raw_spin_lock_init(&desc->lock);
- desc->irq = irq;
+ desc->irq_data.irq = irq;
#ifdef CONFIG_SMP
desc->node = node;
#endif
@@ -151,12 +149,10 @@
static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS_LEGACY-1] = {
- .irq = -1,
- .status = IRQ_DISABLED,
- .chip = &no_irq_chip,
- .handle_irq = handle_bad_irq,
- .depth = 1,
- .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+ .status = IRQ_DISABLED,
+ .handle_irq = handle_bad_irq,
+ .depth = 1,
+ .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
}
};
@@ -183,8 +179,11 @@
kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids *
sizeof(int), GFP_NOWAIT, node);
+ irq_desc_init.irq_data.chip = &no_irq_chip;
+
for (i = 0; i < legacy_count; i++) {
- desc[i].irq = i;
+ desc[i].irq_data.irq = i;
+ desc[i].irq_data.chip = &no_irq_chip;
#ifdef CONFIG_SMP
desc[i].node = node;
#endif
@@ -241,11 +240,10 @@
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
- .status = IRQ_DISABLED,
- .chip = &no_irq_chip,
- .handle_irq = handle_bad_irq,
- .depth = 1,
- .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
+ .status = IRQ_DISABLED,
+ .handle_irq = handle_bad_irq,
+ .depth = 1,
+ .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
}
};
@@ -264,7 +262,8 @@
count = ARRAY_SIZE(irq_desc);
for (i = 0; i < count; i++) {
- desc[i].irq = i;
+ desc[i].irq_data.irq = i;
+ desc[i].irq_data.chip = &no_irq_chip;
alloc_desc_masks(&desc[i], 0, true);
init_desc_masks(&desc[i]);
desc[i].kstat_irqs = kstat_irqs_all[i];