cris: use simple_read_from_buffer()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/cris/kernel/profile.c

@@ -35,19 +35,16 @@ read_cris_profile(struct file *file, char __user *buf,
 		  size_t count, loff_t *ppos)
 {
 	unsigned long p = *ppos;
+	ssize_t ret;
 
-	if (p > SAMPLE_BUFFER_SIZE)
-		return 0;
+	ret = simple_read_from_buffer(buf, count, ppos, sample_buffer,
+						SAMPLE_BUFFER_SIZE);
+	if (ret < 0)
+		return ret;
 
-	if (p + count > SAMPLE_BUFFER_SIZE)
-		count = SAMPLE_BUFFER_SIZE - p;
-	if (copy_to_user(buf, sample_buffer + p,count))
-		return -EFAULT;
+	memset(sample_buffer + p, 0, ret);
 
-	memset(sample_buffer + p, 0, count);
-	*ppos += count;
-
-	return count;
+	return ret;
 }
 
 static ssize_t