nohz: Fix idle ticks in cpu summary line of /proc/stat

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / proc / stat.c

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 64c3b31..e296572 100644 (file)
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -45,10 +45,13 @@ static cputime64_t get_iowait_time(int cpu)
 
 static u64 get_idle_time(int cpu)
 {
-       u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
+       u64 idle, idle_time = -1ULL;
+
+       if (cpu_online(cpu))
+               idle_time = get_cpu_idle_time_us(cpu, NULL);
 
        if (idle_time == -1ULL)
-               /* !NO_HZ so we can rely on cpustat.idle */
+               /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
                idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
        else
                idle = usecs_to_cputime64(idle_time);
@@ -58,10 +61,13 @@ static u64 get_idle_time(int cpu)
 
 static u64 get_iowait_time(int cpu)
 {
-       u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
+       u64 iowait, iowait_time = -1ULL;
+
+       if (cpu_online(cpu))
+               iowait_time = get_cpu_iowait_time_us(cpu, NULL);
 
        if (iowait_time == -1ULL)
-               /* !NO_HZ so we can rely on cpustat.iowait */
+               /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
                iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
        else
                iowait = usecs_to_cputime64(iowait_time);