cpupower : Fix cpupower working when cpu0 is offline

cpuidle_monitor used to assume that cpu0 is always online which is not
a valid assumption on POWER machines. This patch fixes this by getting
the cpu on which the current thread is running, instead of always using
cpu0 for monitoring which may not be online.

Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c b/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
index 1b5da0066ebf..5b3205f16217 100644
--- a/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
+++ b/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
@@ -130,15 +130,18 @@ static struct cpuidle_monitor *cpuidle_register(void)
 {
         int num;
         char *tmp;
+        int this_cpu;
+
+        this_cpu = sched_getcpu();
 
         /* Assume idle state count is the same for all CPUs */
-        cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(0);
+        cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(this_cpu);
 
         if (cpuidle_sysfs_monitor.hw_states_num <= 0)
                 return NULL;
 
         for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
-                tmp = cpuidle_state_name(0, num);
+                tmp = cpuidle_state_name(this_cpu, num);
                 if (tmp == NULL)
                         continue;
 
@@ -146,7 +149,7 @@ static struct cpuidle_monitor *cpuidle_register(void)
                 strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
                 free(tmp);
 
-                tmp = cpuidle_state_desc(0, num);
+                tmp = cpuidle_state_desc(this_cpu, num);
                 if (tmp == NULL)
                         continue;
                 strncpy(cpuidle_cstates[num].desc, tmp, CSTATE_DESC_LEN - 1);