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cpumask: convert kernel/irq

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Impact: Reduce stack usage, use new cpumask API.  ALPHA mod!

Main change is that irq_default_affinity becomes a cpumask_var_t, so
treat it as a pointer (this effects alpha).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2009-01-01 10:12:26 +10:30
parent 6b954823c2
commit d036e67b40
4 changed files with 34 additions and 16 deletions
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34
kernel/irq/proc.c
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@@ -20,7 +20,7 @@ static struct proc_dir_entry *root_irq_dir;
static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
struct irq_desc *desc = irq_to_desc((long)m->private);
cpumask_t *mask = &desc->affinity;
const struct cpumask *mask = &desc->affinity;
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PENDING)
@@ -93,7 +93,7 @@ static const struct file_operations irq_affinity_proc_fops = {
static int default_affinity_show(struct seq_file *m, void *v)
{
seq_cpumask(m, &irq_default_affinity);
seq_cpumask(m, irq_default_affinity);
seq_putc(m, '\n');
return 0;
}
@@ -101,27 +101,37 @@ static int default_affinity_show(struct seq_file *m, void *v)
static ssize_t default_affinity_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
cpumask_t new_value;
cpumask_var_t new_value;
int err;
err = cpumask_parse_user(buffer, count, &new_value);
if (err)
return err;
if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
return -ENOMEM;
if (!is_affinity_mask_valid(new_value))
return -EINVAL;
err = cpumask_parse_user(buffer, count, new_value);
if (err)
goto out;
if (!is_affinity_mask_valid(new_value)) {
err = -EINVAL;
goto out;
}
/*
* 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))
return -EINVAL;
if (!cpumask_intersects(new_value, cpu_online_mask)) {
err = -EINVAL;
goto out;
}
irq_default_affinity = new_value;
cpumask_copy(irq_default_affinity, new_value);
err = count;
return count;
out:
free_cpumask_var(new_value);
return err;
}
static int default_affinity_open(struct inode *inode, struct file *file)