[CPUFREQ] deprecate proc_sys_intf, and inform users of removal ~2005-01-01

The /proc/sys/cpu/ interface was deprecated already when cpufreq was merged
into the kernel. With 2.7. not appearing soon, let's do the same what's
suggested for devfs and others: inform users of it being deprecated
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/cpufreq/cpufreq_userspace.c

@@ -154,6 +154,9 @@ EXPORT_SYMBOL_GPL(cpufreq_setmax);
 
 #ifdef CONFIG_CPU_FREQ_24_API
 
+#warning The /proc/sys/cpu/ and sysctl interface to cpufreq will be removed from the 2.6. kernel series soon after 2005-01-01
+
+static unsigned int warning_print = 0;
 
 /*********************** cpufreq_sysctl interface ********************/
 static int
@@ -169,6 +172,11 @@ cpufreq_procctl(ctl_table *ctl, int write, struct file *filp,
 		return 0;
 	}
 
+	if (!warning_print) {
+		warning_print++;
+		printk(KERN_INFO "Access to /proc/sys/cpu/ is deprecated and will be removed from (new) 2.6. kernels soon after 2005-01-01");
+	}
+
 	if (write) {
 		unsigned int freq;
 
@@ -204,6 +212,11 @@ cpufreq_sysctl(ctl_table *table, int __user *name, int nlen,
 	if (!cpu_online(cpu))
 		return -EINVAL;
 
+	if (!warning_print) {
+		warning_print++;
+		printk(KERN_INFO "Access to /proc/sys/cpu/ is deprecated and will be removed from (new) 2.6. kernels soon after 2005-01-01");
+	}
+
 	if (oldval && oldlenp) {
 		size_t oldlen;