[PATCH v2 10/26] x86, irq: Convert irq_2_pin list to generic list

Yinghai Lu
2013-02-08T19:30:22Z

Now irq_2_pin list is own grown list.
We can use generic list to replace it so we could generic helper
functions to operate it.

Also make free_irq_cfg() free irq_2_pin list to support coming ioapic
hotplug.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Joerg Roedel <joro@8bytes.org>
---
arch/x86/include/asm/hw_irq.h | 2 +-
arch/x86/kernel/apic/io_apic.c | 22 ++++++++++++----------
2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 10a78c3..69743f8 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -121,7 +121,7 @@ struct irq_2_irte {
* Most irqs are mapped 1:1 with pins.
*/
struct irq_cfg {
- struct irq_pin_list *irq_2_pin;
+ struct list_head irq_2_pin;
cpumask_var_t domain;
cpumask_var_t old_domain;
u8 vector;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4c1a726..d2b4988 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -66,7 +66,7 @@
#define __apicdebuginit(type) static type __init

#define for_each_irq_pin(entry, head) \
- for (entry = head; entry; entry = entry->next)
+ list_for_each_entry(entry, &head, list)

/*
* Is the SiS APIC rmw bug present ?
@@ -176,8 +176,8 @@ void mp_save_irq(struct mpc_intsrc *m)
}

struct irq_pin_list {
+ struct list_head list;
int apic, pin;
- struct irq_pin_list *next;
};

static struct irq_pin_list *alloc_irq_pin_list(int node)
@@ -213,6 +213,7 @@ int __init arch_early_irq_init(void)
irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs);

for (i = 0; i < count; i++) {
+ INIT_LIST_HEAD(&cfg[i].irq_2_pin);
irq_set_chip_data(i, &cfg[i]);
zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node);
zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
@@ -245,6 +246,7 @@ static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
goto out_cfg;
if (!zalloc_cpumask_var_node(&cfg->old_domain, GFP_KERNEL, node))
goto out_domain;
+ INIT_LIST_HEAD(&cfg->irq_2_pin);
return cfg;
out_domain:
free_cpumask_var(cfg->domain);
@@ -255,11 +257,15 @@ out_cfg:

static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
{
+ struct irq_pin_list *entry, *tmp;
+
if (!cfg)
return;
irq_set_chip_data(at, NULL);
free_cpumask_var(cfg->domain);
free_cpumask_var(cfg->old_domain);
+ list_for_each_entry_safe(entry, tmp, &cfg->irq_2_pin, list)
+ kfree(entry);
kfree(cfg);
}

@@ -420,15 +426,12 @@ static void ioapic_mask_entry(int apic, int pin)
*/
static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
{
- struct irq_pin_list **last, *entry;
+ struct irq_pin_list *entry;

/* don't allow duplicates */
- last = &cfg->irq_2_pin;
- for_each_irq_pin(entry, cfg->irq_2_pin) {
+ for_each_irq_pin(entry, cfg->irq_2_pin)
if (entry->apic == apic && entry->pin == pin)
return 0;
- last = &entry->next;
- }

entry = alloc_irq_pin_list(node);
if (!entry) {
@@ -439,7 +442,7 @@ static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pi
entry->apic = apic;
entry->pin = pin;

- *last = entry;
+ list_add_tail(&entry->list, &cfg->irq_2_pin);
return 0;
}

@@ -1622,8 +1625,7 @@ __apicdebuginit(void) print_IO_APICs(void)
cfg = irq_get_chip_data(irq);
if (!cfg)
continue;
- entry = cfg->irq_2_pin;
- if (!entry)
+ if (list_empty(&cfg->irq_2_pin))
continue;
printk(KERN_DEBUG "IRQ%d ", irq);
for_each_irq_pin(entry, cfg->irq_2_pin)
--
1.7.10.4