[CPUFREQ] [2/2] demand load governor modules.

Demand-load cpufreq governor modules if needed.
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/cpufreq/cpufreq.c

@@ -321,6 +321,23 @@ static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
 
 		t = __find_governor(str_governor);
 
+		if (t == NULL) {
+			char *name = kasprintf(GFP_KERNEL, "cpufreq_%s", str_governor);
+
+			if (name) {
+				int ret;
+
+				mutex_unlock(&cpufreq_governor_mutex);
+				ret = request_module(name);
+				mutex_lock(&cpufreq_governor_mutex);
+
+				if (ret == 0)
+					t = __find_governor(str_governor);
+			}
+
+			kfree(name);
+		}
+
 		if (t != NULL) {
 			*governor = t;
 			err = 0;