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>

1 files changed, 51 insertions, 45 deletions

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 6c6d35d68ee9..a09dd29c2fd7 100644
--- 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 +17,18 @@ 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
 }