linux-kernel - [tip: sched/core] leds: Use all-in-one vtime aware kcpustat accessor

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Date:   Thu, 21 Nov 2019 16:48:07 -0000
From:   "tip-bot2 for Frederic Weisbecker" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] leds: Use all-in-one vtime aware kcpustat accessor

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

Commit-ID:     8688f2fb671b2ed59b1b16083136b6edc3750435
Gitweb:        https://git.kernel.org/tip/8688f2fb671b2ed59b1b16083136b6edc3750435
Author:        Frederic Weisbecker <frederic@...nel.org>
AuthorDate:    Thu, 21 Nov 2019 03:44:29 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 21 Nov 2019 07:58:48 +01:00

leds: Use all-in-one vtime aware kcpustat accessor

We can now safely read user kcpustat fields on nohz_full CPUs.
Use the appropriate accessor.

[ mingo: Fixed build failure. ]

Reported-by: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Jacek Anaszewski <jacek.anaszewski@...il.com> (maintainer:LED SUBSYSTEM)
Cc: Pavel Machek <pavel@....cz> (maintainer:LED SUBSYSTEM)
Cc: Dan Murphy <dmurphy@...com> (reviewer:LED SUBSYSTEM)
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wanpeng Li <wanpengli@...cent.com>
Link: https://lkml.kernel.org/r/20191121024430.19938-6-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/leds/trigger/ledtrig-activity.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
index ddfc5ed..14ba7fa 100644
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -57,11 +57,15 @@ static void led_activity_function(struct timer_list *t)
 	curr_used = 0;
 
 	for_each_possible_cpu(i) {
-		curr_used += kcpustat_cpu(i).cpustat[CPUTIME_USER]
-			  +  kcpustat_cpu(i).cpustat[CPUTIME_NICE]
-			  +  kcpustat_field(&kcpustat_cpu(i), CPUTIME_SYSTEM, i)
-			  +  kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]
-			  +  kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
+		struct kernel_cpustat kcpustat;
+
+		kcpustat_cpu_fetch(&kcpustat, i);
+
+		curr_used += kcpustat.cpustat[CPUTIME_USER]
+			  +  kcpustat.cpustat[CPUTIME_NICE]
+			  +  kcpustat.cpustat[CPUTIME_SYSTEM]
+			  +  kcpustat.cpustat[CPUTIME_SOFTIRQ]
+			  +  kcpustat.cpustat[CPUTIME_IRQ];
 		cpus++;
 	}