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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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3
arch/alpha/kernel/irq.c
View file

@ -50,7 +50,8 @@ int irq_select_affinity(unsigned int irq)
if (!irq_desc[irq].chip->set_affinity || irq_user_affinity[irq])
return 1;
while (!cpu_possible(cpu) || !cpu_isset(cpu, irq_default_affinity))
while (!cpu_possible(cpu) ||
!cpumask_test_cpu(cpu, irq_default_affinity))
cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
last_cpu = cpu;

2
include/linux/interrupt.h
View file

@ -109,7 +109,7 @@ extern void enable_irq(unsigned int irq);
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
extern cpumask_t irq_default_affinity;
extern cpumask_var_t irq_default_affinity;
extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
extern int irq_can_set_affinity(unsigned int irq);

11
kernel/irq/manage.c
View file

@ -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)
@ -127,7 +134,7 @@ int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
desc->status &= ~IRQ_AFFINITY_SET;
}
cpumask_and(&desc->affinity, cpu_online_mask, &irq_default_affinity);
cpumask_and(&desc->affinity, cpu_online_mask, irq_default_affinity);
set_affinity:
desc->chip->set_affinity(irq, &desc->affinity);

34
kernel/irq/proc.c
View file

@ -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)