kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 24 insertions, 21 deletions

diff --git a/kernel/profile.c b/kernel/profile.c
index 419250ebec4d..a55d3a367ae8 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -442,48 +442,51 @@ void profile_tick(int type)
 
 #ifdef CONFIG_PROC_FS
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <asm/uaccess.h>
 
-static int prof_cpu_mask_read_proc(char *page, char **start, off_t off,
-                        int count, int *eof, void *data)
+static int prof_cpu_mask_proc_show(struct seq_file *m, void *v)
 {
-        int len = cpumask_scnprintf(page, count, data);
-        if (count - len < 2)
-                return -EINVAL;
-        len += sprintf(page + len, "\n");
-        return len;
+        seq_cpumask(m, prof_cpu_mask);
+        seq_putc(m, '\n');
+        return 0;
 }
 
-static int prof_cpu_mask_write_proc(struct file *file,
-        const char __user *buffer,  unsigned long count, void *data)
+static int prof_cpu_mask_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, prof_cpu_mask_proc_show, NULL);
+}
+
+static ssize_t prof_cpu_mask_proc_write(struct file *file,
+        const char __user *buffer, size_t count, loff_t *pos)
 {
-        struct cpumask *mask = data;
-        unsigned long full_count = count, err;
         cpumask_var_t new_value;
+        int err;
 
         if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
                 return -ENOMEM;
 
         err = cpumask_parse_user(buffer, count, new_value);
         if (!err) {
-                cpumask_copy(mask, new_value);
-                err = full_count;
+                cpumask_copy(prof_cpu_mask, new_value);
+                err = count;
         }
         free_cpumask_var(new_value);
         return err;
 }
 
+static const struct file_operations prof_cpu_mask_proc_fops = {
+        .open           = prof_cpu_mask_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+        .write          = prof_cpu_mask_proc_write,
+};
+
 void create_prof_cpu_mask(struct proc_dir_entry *root_irq_dir)
 {
-        struct proc_dir_entry *entry;
-
         /* create /proc/irq/prof_cpu_mask */
-        entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
-        if (!entry)
-                return;
-        entry->data = prof_cpu_mask;
-        entry->read_proc = prof_cpu_mask_read_proc;
-        entry->write_proc = prof_cpu_mask_write_proc;
+        proc_create("prof_cpu_mask", 0600, root_irq_dir, &prof_cpu_mask_proc_fops);
 }
 
 /*