Disable the code to generate a simple table from the status MSR by default.

This can be enabled by setting the 'hw.est.msr_info' tunable to 1.

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/i386/cpufreq/est.c b/sys/i386/cpufreq/est.c
index 594199e..c75a31a 100644
--- a/sys/i386/cpufreq/est.c
+++ b/sys/i386/cpufreq/est.c
@@ -94,6 +94,8 @@ struct est_softc {
 
 const char intel_id[] = "GenuineIntel";
 const char centaur_id[] = "CentaurHauls";
+static int msr_info_enabled = 0;
+TUNABLE_INT("hw.est.msr_info", &msr_info_enabled);
 
 /* Default bus clock value for Centrino processors. */
 #define INTEL_BUS_CLK		100
@@ -1196,6 +1198,9 @@ est_msr_info(device_t dev, uint64_t msr, freq_info **freqs)
 	int bus, freq, volts;
 	uint16_t id;
 
+	if (!msr_info_enabled)
+		return (EOPNOTSUPP);
+
 	/* Figure out the bus clock. */
 	freq = tsc_freq / 1000000;
 	id = msr >> 32;