cpufreq: Kill userspace CPU boosting entirely

Kernel-based CPU boosting is used now, so stop userspace from messing with
it by turning scaling_min_freq into a no-op. Note that this is done instead
of making scaling_min_freq read-only so that userspace doesn't spit out
error messages when it can't do its boosting.

Signed-off-by: Sultan Alsawaf <[email protected]>
Signed-off-by: Danny Lin <[email protected]>

Author: kerneltoast

drivers/cpufreq/cpufreq.c

@@ -706,6 +706,9 @@ static ssize_t store_##file_name					\
 	int ret, temp;							\
 	struct cpufreq_policy new_policy;				\
 									\
+	if (&policy->object == &policy->min)				\
+		return count;						\
+									\
 	memcpy(&new_policy, policy, sizeof(*policy));			\
 	new_policy.min = policy->user_policy.min;			\
 	new_policy.max = policy->user_policy.max;			\