Commit e98f033f authored Dec 01, 2015 by Jacob Tanenbaum Committed by Rafael J. Wysocki Dec 03, 2015

cpupower: fix how "cpupower frequency-info" interprets latency



the intel-pstate driver does not support the ondemand governor and does not
have a valid value in
/sys/devices/system/cpu/cpu[x]/cpufreq/cpuinfo_transition_latency. The
intel-pstate driver sets cpuinfo_transition_latency to CPUFREQ_ETERNAL (-1),
the value written into cpuinfo_transition_latency is defind as an unsigned
int so checking the read value against max unsigned int will determine if the
value is valid.

Signed-off-by: Jacob Tanenbaum <jtanenba@redhat.com>
Signed-off-by: Thomas Renninger <trenn@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 562e5f1a

tools/power/cpupower/utils/cpufreq-info.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -434,8 +434,8 @@ static int get_latency(unsigned int cpu, unsigned int human)
		unsigned long latency = cpufreq_get_transition_latency(cpu);

		printf(_(" maximum transition latency: "));
		if (!latency) {
		printf(_(" Cannot determine latency.\n"));
		if (!latency \|\| latency == UINT_MAX) {
		printf(_(" Cannot determine or is not supported.\n"));
		return -EINVAL;
		}