cpupower: revise is_valid flag handling for idle_monitor

The is_valid flag should reflect the validity state of both
the XXX_start and XXX_stop functions. But the use of '=' in
XXX_stop overwrites the validity state set by XXX_start. This
commit changes '=' to '|=' in XXX_stop to preserve and combine
the validity state of XXX_start and XXX_stop.

Signed-off-by: wangfushuai <wangfushuai@baidu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: wangfushuai

tools/power/cpupower/utils/idle_monitor/hsw_ext_idle.c

@@ -117,7 +117,7 @@ static int hsw_ext_start(void)
 
 	for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 		for (cpu = 0; cpu < cpu_count; cpu++) {
-			hsw_ext_get_count(num, &val, cpu);
+			is_valid[cpu] = !hsw_ext_get_count(num, &val, cpu);
 			previous_count[num][cpu] = val;
 		}
 	}
@@ -134,7 +134,7 @@ static int hsw_ext_stop(void)
 
 	for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) {
 		for (cpu = 0; cpu < cpu_count; cpu++) {
-			is_valid[cpu] = !hsw_ext_get_count(num, &val, cpu);
+			is_valid[cpu] |= !hsw_ext_get_count(num, &val, cpu);
 			current_count[num][cpu] = val;
 		}
 	}

tools/power/cpupower/utils/idle_monitor/mperf_monitor.c

@@ -148,7 +148,7 @@ static int mperf_measure_stats(unsigned int cpu)
 	ret = get_aperf_mperf(cpu, &aval, &mval);
 	aperf_current_count[cpu] = aval;
 	mperf_current_count[cpu] = mval;
-	is_valid[cpu] = !ret;
+	is_valid[cpu] |= !ret;
 
 	return 0;
 }

tools/power/cpupower/utils/idle_monitor/nhm_idle.c

@@ -151,7 +151,7 @@ static int nhm_stop(void)
 
 	for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 		for (cpu = 0; cpu < cpu_count; cpu++) {
-			is_valid[cpu] = !nhm_get_count(num, &val, cpu);
+			is_valid[cpu] |= !nhm_get_count(num, &val, cpu);
 			current_count[num][cpu] = val;
 		}
 	}

tools/power/cpupower/utils/idle_monitor/snb_idle.c

@@ -115,7 +115,7 @@ static int snb_start(void)
 
 	for (num = 0; num < SNB_CSTATE_COUNT; num++) {
 		for (cpu = 0; cpu < cpu_count; cpu++) {
-			snb_get_count(num, &val, cpu);
+			is_valid[cpu] = !snb_get_count(num, &val, cpu);
 			previous_count[num][cpu] = val;
 		}
 	}
@@ -132,7 +132,7 @@ static int snb_stop(void)
 
 	for (num = 0; num < SNB_CSTATE_COUNT; num++) {
 		for (cpu = 0; cpu < cpu_count; cpu++) {
-			is_valid[cpu] = !snb_get_count(num, &val, cpu);
+			is_valid[cpu] |= !snb_get_count(num, &val, cpu);
 			current_count[num][cpu] = val;
 		}
 	}