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authorLen Brown <len.brown@intel.com>2009-01-09 03:39:43 -0500
committerLen Brown <len.brown@intel.com>2009-01-09 03:39:43 -0500
commitb2576e1d4408e134e2188c967b1f28af39cd79d4 (patch)
tree004f3c82faab760f304ce031d6d2f572e7746a50 /kernel/irq/manage.c
parent3cc8a5f4ba91f67bbdb81a43a99281a26aab8d77 (diff)
parent2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f (diff)
Merge branch 'linus' into release
Diffstat (limited to 'kernel/irq/manage.c')
-rw-r--r--kernel/irq/manage.c58
1 files changed, 39 insertions, 19 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 801addda3c4..cd0cd8dcb34 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -16,8 +16,15 @@
#include "internals.h"
#ifdef CONFIG_SMP
+cpumask_var_t irq_default_affinity;
-cpumask_t irq_default_affinity = CPU_MASK_ALL;
+static int init_irq_default_affinity(void)
+{
+ alloc_cpumask_var(&irq_default_affinity, GFP_KERNEL);
+ cpumask_setall(irq_default_affinity);
+ return 0;
+}
+core_initcall(init_irq_default_affinity);
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
@@ -79,7 +86,7 @@ int irq_can_set_affinity(unsigned int irq)
* @cpumask: cpumask
*
*/
-int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
+int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
@@ -91,14 +98,14 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
- desc->affinity = cpumask;
+ cpumask_copy(&desc->affinity, cpumask);
desc->chip->set_affinity(irq, cpumask);
} else {
desc->status |= IRQ_MOVE_PENDING;
- desc->pending_mask = cpumask;
+ cpumask_copy(&desc->pending_mask, cpumask);
}
#else
- desc->affinity = cpumask;
+ cpumask_copy(&desc->affinity, cpumask);
desc->chip->set_affinity(irq, cpumask);
#endif
desc->status |= IRQ_AFFINITY_SET;
@@ -112,26 +119,24 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
*/
int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
{
- cpumask_t mask;
-
if (!irq_can_set_affinity(irq))
return 0;
- cpus_and(mask, cpu_online_map, irq_default_affinity);
-
/*
* Preserve an userspace affinity setup, but make sure that
* one of the targets is online.
*/
if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
- if (cpus_intersects(desc->affinity, cpu_online_map))
- mask = desc->affinity;
+ if (cpumask_any_and(&desc->affinity, cpu_online_mask)
+ < nr_cpu_ids)
+ goto set_affinity;
else
desc->status &= ~IRQ_AFFINITY_SET;
}
- desc->affinity = mask;
- desc->chip->set_affinity(irq, mask);
+ cpumask_and(&desc->affinity, cpu_online_mask, irq_default_affinity);
+set_affinity:
+ desc->chip->set_affinity(irq, &desc->affinity);
return 0;
}
@@ -370,16 +375,18 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
return 0;
}
- ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+ /* caller masked out all except trigger mode flags */
+ ret = chip->set_type(irq, flags);
if (ret)
pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
- (int)(flags & IRQF_TRIGGER_MASK),
- irq, chip->set_type);
+ (int)flags, irq, chip->set_type);
else {
+ if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+ flags |= IRQ_LEVEL;
/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
- desc->status &= ~IRQ_TYPE_SENSE_MASK;
- desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+ desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
+ desc->status |= flags;
}
return ret;
@@ -459,7 +466,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
/* Setup the type (level, edge polarity) if configured: */
if (new->flags & IRQF_TRIGGER_MASK) {
- ret = __irq_set_trigger(desc, irq, new->flags);
+ ret = __irq_set_trigger(desc, irq,
+ new->flags & IRQF_TRIGGER_MASK);
if (ret) {
spin_unlock_irqrestore(&desc->lock, flags);
@@ -673,6 +681,18 @@ int request_irq(unsigned int irq, irq_handler_t handler,
struct irq_desc *desc;
int retval;
+ /*
+ * handle_IRQ_event() always ignores IRQF_DISABLED except for
+ * the _first_ irqaction (sigh). That can cause oopsing, but
+ * the behavior is classified as "will not fix" so we need to
+ * start nudging drivers away from using that idiom.
+ */
+ if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
+ == (IRQF_SHARED|IRQF_DISABLED))
+ pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
+ "guaranteed on shared IRQs\n",
+ irq, devname);
+
#ifdef CONFIG_LOCKDEP
/*
* Lockdep wants atomic interrupt handlers: