[tip: sched/core] rackmeter: Use vtime aware kcpustat accessor

[tip-bot2 for Frederic Weisbecker]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     8392853e964c025b0616bd54c0cdf9cbc3c9a769
Gitweb:        https://git.kernel.org/tip/8392853e964c025b0616bd54c0cdf9cbc3c9a769
Author:        Frederic Weisbecker <frederic@xxxxxxxxxx>
AuthorDate:    Thu, 21 Nov 2019 03:44:30 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 21 Nov 2019 07:59:00 +01:00

rackmeter: Use vtime aware kcpustat accessor

Now that we have a vtime safe kcpustat accessor, use it to fetch
CPUTIME_NICE and fix frozen kcpustat values on nohz_full CPUs.

Reported-by: Yauheni Kaliuta <yauheni.kaliuta@xxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Wanpeng Li <wanpengli@xxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20191121024430.19938-7-frederic@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 drivers/macintosh/rack-meter.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c
index 4134e58..60311e8 100644
--- a/drivers/macintosh/rack-meter.c
+++ b/drivers/macintosh/rack-meter.c
@@ -81,13 +81,14 @@ static int rackmeter_ignore_nice;
  */
 static inline u64 get_cpu_idle_time(unsigned int cpu)
 {
+	struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu);
 	u64 retval;
 
-	retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
-		 kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
+	retval = kcpustat->cpustat[CPUTIME_IDLE] +
+		 kcpustat->cpustat[CPUTIME_IOWAIT];
 
 	if (rackmeter_ignore_nice)
-		retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+		retval += kcpustat_field(kcpustat, CPUTIME_NICE, cpu);
 
 	return retval;
 }