linux-kernel - [PATCH 8/9] leds: Use all-in-one vtime aware kcpustat accessor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20191106030807.31091-9-frederic@kernel.org>
Date:   Wed,  6 Nov 2019 04:08:06 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Pavel Machek <pavel@....cz>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rik van Riel <riel@...riel.com>
Subject: [PATCH 8/9] 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.

Reported-by: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rik van Riel <riel@...riel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wanpeng Li <wanpengli@...cent.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 drivers/leds/trigger/ledtrig-activity.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
index ddfc5edd07c8..20250de1138d 100644
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -57,9 +57,12 @@ 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)
+		u64 user, nice, sys, guest, guest_nice;
+
+		kcpustat_cputime(&kcpustat_cpu(i), i, &user, &nice, &sys,
+				 &guest, &guest_nice);
+
+		curr_used += user + nice + sys
 			  +  kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]
 			  +  kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
 		cpus++;
-- 
2.23.0