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Date: Thu, 8 May 2008 02:35:48 +0400
From: Alexey Dobriyan <adobriyan@...il.com>
To: akpm@...l.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] proc: convert /proc/irq/*/{smp_affinity,spurious} to
seq_files
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
Don't even think applying this before fixed
bitmask_scnprintf_len()!
kernel/irq/proc.c | 78 ++++++++++++++++++++++++++++++------------------------
1 file changed, 44 insertions(+), 34 deletions(-)
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -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 +17,23 @@ 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)v;
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);
+ seq_cpumask(m, mask);
+ seq_putc(m, '\n');
+ return 0;
+}
- if (count - len < 2)
- return -EINVAL;
- len += sprintf(page + len, "\n");
- return len;
+static int irq_affinity_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
}
#ifndef is_affinity_mask_valid
@@ -40,11 +41,12 @@ 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 *ppos)
{
- 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, tmp;
+ int err;
if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
@@ -66,27 +68,46 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
if (cpus_empty(tmp))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
- return select_smp_affinity(irq) ? -EINVAL : full_count;
+ return select_smp_affinity(irq) ? -EINVAL : count;
irq_set_affinity(irq, new_value);
- return full_count;
+ return count;
}
+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,
+};
#endif
-static int irq_spurious_read(char *page, char **start, off_t off,
- int count, int *eof, void *data)
+static int irq_spurious_proc_show(struct seq_file *m, void *v)
{
- struct irq_desc *d = &irq_desc[(long) data];
- return sprintf(page, "count %u\n"
+ struct irq_desc *d = &irq_desc[(long) m->private];
+ seq_printf(m, "count %u\n"
"unhandled %u\n"
"last_unhandled %u ms\n",
d->irq_count,
d->irqs_unhandled,
jiffies_to_msecs(d->last_unhandled));
+ return 0;
+}
+
+static int irq_spurious_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, irq_spurious_proc_show, PDE(inode)->data);
}
+static const struct file_operations irq_spurious_proc_fops = {
+ .open = irq_spurious_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
#define MAX_NAMELEN 128
static int name_unique(unsigned int irq, struct irqaction *new_action)
@@ -130,7 +151,6 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
void register_irq_proc(unsigned int irq)
{
char name [MAX_NAMELEN];
- struct proc_dir_entry *entry;
if (!root_irq_dir ||
(irq_desc[irq].chip == &no_irq_chip) ||
@@ -144,23 +164,13 @@ 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);
- if (entry) {
- entry->data = (void *)(long)irq;
- entry->read_proc = irq_spurious_read;
- }
+ proc_create_data("spurious", 0444, irq_desc[irq].dir,
+ &irq_spurious_proc_fops, (void *)(long)irq);
}
#undef MAX_NAMELEN
--
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