Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod."

This reverts commit e088e4c9cdb618675874becb91b2fd581ee707e6.

Removing the sysfs interface for p4-clockmod was flagged as a
regression in bug 12826.

Course of action:
 - Find out the remaining causes of overheating, and fix them
   if possible. ACPI should be doing the right thing automatically.
   If it isn't, we need to fix that.
 - mark p4-clockmod ui as deprecated
 - try again with the removal in six months.

It's not really feasible to printk about the deprecation, because
it needs to happen at all the sysfs entry points, which means adding
a lot of strcmp("p4-clockmod".. calls to the core, which.. bleuch.

Signed-off-by: Dave Jones <davej@redhat.com>

3 files changed, 18 insertions, 35 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c b/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
index b585e04c..3178c3a 100644
--- a/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
+++ b/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
@@ -277,7 +277,6 @@ static struct cpufreq_driver p4clockmod_driver = {
 	.name		= "p4-clockmod",
 	.owner		= THIS_MODULE,
 	.attr		= p4clockmod_attr,
-	.hide_interface	= 1,
 };
 
 
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b55cb67..d6daf3c 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -754,11 +754,6 @@ static struct kobj_type ktype_cpufreq = {
 	.release	= cpufreq_sysfs_release,
 };
 
-static struct kobj_type ktype_empty_cpufreq = {
-	.sysfs_ops	= &sysfs_ops,
-	.release	= cpufreq_sysfs_release,
-};
-
 
 /**
  * cpufreq_add_dev - add a CPU device
@@ -892,36 +887,26 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
 	memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
 
 	/* prepare interface data */
-	if (!cpufreq_driver->hide_interface) {
-		ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
-					   &sys_dev->kobj, "cpufreq");
+	ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &sys_dev->kobj,
+				   "cpufreq");
+	if (ret)
+		goto err_out_driver_exit;
+
+	/* set up files for this cpu device */
+	drv_attr = cpufreq_driver->attr;
+	while ((drv_attr) && (*drv_attr)) {
+		ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
 		if (ret)
 			goto err_out_driver_exit;
-
-		/* set up files for this cpu device */
-		drv_attr = cpufreq_driver->attr;
-		while ((drv_attr) && (*drv_attr)) {
-			ret = sysfs_create_file(&policy->kobj,
-						&((*drv_attr)->attr));
-			if (ret)
-				goto err_out_driver_exit;
-			drv_attr++;
-		}
-		if (cpufreq_driver->get) {
-			ret = sysfs_create_file(&policy->kobj,
-						&cpuinfo_cur_freq.attr);
-			if (ret)
-				goto err_out_driver_exit;
-		}
-		if (cpufreq_driver->target) {
-			ret = sysfs_create_file(&policy->kobj,
-						&scaling_cur_freq.attr);
-			if (ret)
-				goto err_out_driver_exit;
-		}
-	} else {
-		ret = kobject_init_and_add(&policy->kobj, &ktype_empty_cpufreq,
-					   &sys_dev->kobj, "cpufreq");
+		drv_attr++;
+	}
+	if (cpufreq_driver->get) {
+		ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
+		if (ret)
+			goto err_out_driver_exit;
+	}
+	if (cpufreq_driver->target) {
+		ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
 		if (ret)
 			goto err_out_driver_exit;
 	}
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 384b38d..1610427 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -234,7 +234,6 @@ struct cpufreq_driver {
 	int	(*suspend)	(struct cpufreq_policy *policy, pm_message_t pmsg);
 	int	(*resume)	(struct cpufreq_policy *policy);
 	struct freq_attr	**attr;
-	bool			hide_interface;
 };
 
 /* flags */