Patch "cpupower : Fix cpupower working when cpu0 is offline" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

cpupower : Fix cpupower working when cpu0 is offline

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
cpupower-fix-cpupower-working-when-cpu0-is-offline.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Abhishek Goel <[email protected]>
Date: Wed, 15 Nov 2017 14:10:02 +0530
Subject: cpupower : Fix cpupower working when cpu0 is offline

From: Abhishek Goel <[email protected]>

[ Upstream commit dbdc468f35ee827cab2753caa1c660bdb832243a ]

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.

---
 tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -130,15 +130,18 @@ static struct cpuidle_monitor *cpuidle_r
 {
 	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_r
 		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);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/cpupowerutils-bench-fix-cpu-online-check.patch queue-4.9/cpupower-fix-cpupower-working-when-cpu0-is-offline.patch