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genirq: switch /proc/irq/*/smp_affinity et al to seqfiles 

Switch /proc/irq/*/smp_affinity , /proc/irq/default_smp_affinity to
seq_files.

cat(1) reads with 1024 chunks by default, with high enough NR_CPUS, there
will be -EINVAL.

As side effect, there are now two less users of the ->read_proc interface.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Mike Travis <travis@sgi.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2008-08-12 15:09:03 -07:00 committed by Linus Torvalds
parent 50ac2d694f
commit f18e439d10
1 changed files with 51 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
kernel/irq/proc.c
View File

@ -8,6 +8,7 @@
#include <linux/irq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include "internals.h"
@ -16,23 +17,18 @@ static struct proc_dir_entry *root_irq_dir;
#ifdef CONFIG_SMP
static int irq_affinity_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
struct irq_desc *desc = irq_desc + (long)data;
struct irq_desc *desc = irq_desc + (long)m->private;
cpumask_t *mask = &desc->affinity;
int len;
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PENDING)
mask = &desc->pending_mask;
#endif
len = cpumask_scnprintf(page, count, *mask);
if (count - len < 2)
return -EINVAL;
len += sprintf(page + len, "\n");
return len;
seq_cpumask(m, mask);
seq_putc(m, '\n');
return 0;
}
#ifndef is_affinity_mask_valid
@ -40,11 +36,12 @@ static int irq_affinity_read_proc(char *page, char **start, off_t off,
#endif
int no_irq_affinity;
static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
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)data, full_count = count, err;
unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
cpumask_t new_value;
int err;
if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
@ -65,28 +62,38 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
if (!cpus_intersects(new_value, cpu_online_map))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
return irq_select_affinity(irq) ? -EINVAL : full_count;
return irq_select_affinity(irq) ? -EINVAL : count;
irq_set_affinity(irq, new_value);
return full_count;
return count;
}
static int default_affinity_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
static int irq_affinity_proc_open(struct inode *inode, struct file *file)
{
int len = cpumask_scnprintf(page, count, irq_default_affinity);
if (count - len < 2)
return -EINVAL;
len += sprintf(page + len, "\n");
return len;
return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
}
static int default_affinity_write(struct file *file, const char __user *buffer,
unsigned long count, void *data)
static const struct file_operations irq_affinity_proc_fops = {
.open = irq_affinity_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = irq_affinity_proc_write,
};
static int default_affinity_show(struct seq_file *m, void *v)
{
seq_cpumask(m, &irq_default_affinity);
seq_putc(m, '\n');
return 0;
}
static ssize_t default_affinity_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
unsigned int full_count = count, err;
cpumask_t new_value;
int err;
err = cpumask_parse_user(buffer, count, new_value);
if (err)
@ -105,8 +112,21 @@ static int default_affinity_write(struct file *file, const char __user *buffer,
irq_default_affinity = new_value;
return full_count;
return count;
}
static int default_affinity_open(struct inode *inode, struct file *file)
{
return single_open(file, default_affinity_show, NULL);
}
static const struct file_operations default_affinity_proc_fops = {
.open = default_affinity_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = default_affinity_write,
};
#endif
static int irq_spurious_read(char *page, char **start, off_t off,
@ -178,16 +198,9 @@ void register_irq_proc(unsigned int irq)
irq_desc[irq].dir = proc_mkdir(name, root_irq_dir);
#ifdef CONFIG_SMP
{
/* create /proc/irq/<irq>/smp_affinity */
entry = create_proc_entry("smp_affinity", 0600, irq_desc[irq].dir);
if (entry) {
entry->data = (void *)(long)irq;
entry->read_proc = irq_affinity_read_proc;
entry->write_proc = irq_affinity_write_proc;
}
}
/* create /proc/irq/<irq>/smp_affinity */
proc_create_data("smp_affinity", 0600, irq_desc[irq].dir,
&irq_affinity_proc_fops, (void *)(long)irq);
#endif
entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir);
@ -208,15 +221,8 @@ void unregister_handler_proc(unsigned int irq, struct irqaction *action)
void register_default_affinity_proc(void)
{
#ifdef CONFIG_SMP
struct proc_dir_entry *entry;
/* create /proc/irq/default_smp_affinity */
entry = create_proc_entry("default_smp_affinity", 0600, root_irq_dir);
if (entry) {
entry->data = NULL;
entry->read_proc = default_affinity_read;
entry->write_proc = default_affinity_write;
}
proc_create("irq/default_smp_affinity", 0600, NULL,
&default_affinity_proc_fops);
#endif
}