1 files changed, 10 insertions, 4 deletions

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 64c3b3172367..e296572c73ed 100644
--- 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);