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authorRusty Russell <rusty@rustcorp.com.au>2008-12-13 21:20:26 +1030
committerRusty Russell <rusty@rustcorp.com.au>2008-12-13 21:20:26 +1030
commit0de26520c7cabf36e1de090ea8092f011a6106ce (patch)
tree3d02e509b6315fdfd9cdb8c9e0b9ed0a30cf9384 /kernel/irq
parent29c0177e6a4ac094302bed54a1d4bbb6b740a9ef (diff)
downloadop-kernel-dev-0de26520c7cabf36e1de090ea8092f011a6106ce.zip
op-kernel-dev-0de26520c7cabf36e1de090ea8092f011a6106ce.tar.gz
cpumask: make irq_set_affinity() take a const struct cpumask
Impact: change existing irq_chip API Not much point with gentle transition here: the struct irq_chip's setaffinity method signature needs to change. Fortunately, not widely used code, but hits a few architectures. Note: In irq_select_affinity() I save a temporary in by mangling irq_desc[irq].affinity directly. Ingo, does this break anything? (Folded in fix from KOSAKI Motohiro) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Grant Grundler <grundler@parisc-linux.org> Acked-by: Ingo Molnar <mingo@redhat.com> Cc: ralf@linux-mips.org Cc: grundler@parisc-linux.org Cc: jeremy@xensource.com Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c2
-rw-r--r--kernel/irq/manage.c22
-rw-r--r--kernel/irq/migration.c14
-rw-r--r--kernel/irq/proc.c29
4 files changed, 37 insertions, 30 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 10b5092..58d8e31 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -45,7 +45,7 @@ void dynamic_irq_init(unsigned int irq)
desc->irq_count = 0;
desc->irqs_unhandled = 0;
#ifdef CONFIG_SMP
- cpus_setall(desc->affinity);
+ cpumask_setall(&desc->affinity);
#endif
spin_unlock_irqrestore(&desc->lock, flags);
}
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 801addd..10ad2f8 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -79,7 +79,7 @@ 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 +91,14 @@ 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 +112,24 @@ 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;
}
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 9db681d..bd72329 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -4,7 +4,6 @@
void move_masked_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
- cpumask_t tmp;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
@@ -19,7 +18,7 @@ void move_masked_irq(int irq)
desc->status &= ~IRQ_MOVE_PENDING;
- if (unlikely(cpus_empty(desc->pending_mask)))
+ if (unlikely(cpumask_empty(&desc->pending_mask)))
return;
if (!desc->chip->set_affinity)
@@ -27,8 +26,6 @@ void move_masked_irq(int irq)
assert_spin_locked(&desc->lock);
- cpus_and(tmp, desc->pending_mask, cpu_online_map);
-
/*
* If there was a valid mask to work with, please
* do the disable, re-program, enable sequence.
@@ -41,10 +38,13 @@ void move_masked_irq(int irq)
* For correct operation this depends on the caller
* masking the irqs.
*/
- if (likely(!cpus_empty(tmp))) {
- desc->chip->set_affinity(irq,tmp);
+ if (likely(cpumask_any_and(&desc->pending_mask, cpu_online_mask)
+ < nr_cpu_ids)) {
+ cpumask_and(&desc->affinity,
+ &desc->pending_mask, cpu_online_mask);
+ desc->chip->set_affinity(irq, &desc->affinity);
}
- cpus_clear(desc->pending_mask);
+ cpumask_clear(&desc->pending_mask);
}
void move_native_irq(int irq)
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index f293349..8e91c97 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -40,33 +40,42 @@ static ssize_t irq_affinity_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
- cpumask_t new_value;
+ cpumask_var_t new_value;
int err;
if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
return -EIO;
- err = cpumask_parse_user(buffer, count, &new_value);
+ if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+ return -ENOMEM;
+
+ err = cpumask_parse_user(buffer, count, new_value);
if (err)
- return err;
+ goto free_cpumask;
- if (!is_affinity_mask_valid(new_value))
- return -EINVAL;
+ if (!is_affinity_mask_valid(*new_value)) {
+ err = -EINVAL;
+ goto free_cpumask;
+ }
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
*/
- if (!cpus_intersects(new_value, cpu_online_map))
+ if (!cpumask_intersects(new_value, cpu_online_mask)) {
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
- return irq_select_affinity_usr(irq) ? -EINVAL : count;
-
- irq_set_affinity(irq, new_value);
+ err = irq_select_affinity_usr(irq) ? -EINVAL : count;
+ } else {
+ irq_set_affinity(irq, new_value);
+ err = count;
+ }
- return count;
+free_cpumask:
+ free_cpumask_var(new_value);
+ return err;
}
static int irq_affinity_proc_open(struct inode *inode, struct file *file)
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