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Message-ID: <CA+G9fYsYVuEpL5KnYdq4ciRmpnUMQqkNQHmy7y5XvUm48kjxyA@mail.gmail.com>
Date: Tue, 10 Jun 2025 12:48:18 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Linux ARM <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>, linux-clk <linux-clk@...r.kernel.org>,
lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Sudeep Holla <sudeep.holla@....com>, Anna-Maria Behnsen <anna-maria@...utronix.de>,
Frederic Weisbecker <frederic@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Liviu Dudau <liviu.dudau@....com>, Lorenzo Pieralisi <lpieralisi@...nel.org>,
Mark Rutland <mark.rutland@....com>, Arnd Bergmann <arnd@...db.de>,
Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>
Subject: Juno-r2 WARNING kernel time clockevents.c cev_delta2ns clockevents_config.part
Regression while booting Juno-r2 with the Linux next-20250606
the following kernel warnings found.
This boot warning was reproduced with juno-r2.dtb and juno-r2-scmi.dtb.
Regressions found on Juno-r2
- boot warning
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
First seen on the next-20250606
Good: next-20250512
Bad: next-20250606
The suspected patch that found between tags is,
# git show next-20250512..next-20250513 --
arch/arm64/boot/dts/arm/juno-base.dtsi
commit 1fa3ed04ac55134063e3cd465b41aeb26715e52a
Author: Sudeep Holla <sudeep.holla@....com>
Date: Mon May 12 11:11:32 2025 +0100
arm64: dts: arm: Drop the clock-frequency property from timer nodes
Drop the clock-frequency property from the timer nodes, since it must be
configured by the boot/secure firmware.
Cc: Liviu Dudau <liviu.dudau@....com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Message-Id: <20250512101132.1743920-1-sudeep.holla@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi
b/arch/arm64/boot/dts/arm/juno-base.dtsi
index 055764d0b9e5..9ccb80821bdb 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -10,7 +10,6 @@ / {
memtimer: timer@...10000 {
compatible = "arm,armv7-timer-mem";
reg = <0x0 0x2a810000 0x0 0x10000>;
- clock-frequency = <50000000>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x0 0x2a820000 0x20000>;
Boot regression: Juno-r2 WARNING kernel time clockevents.c
cev_delta2ns clockevents_config.part
Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
## Boot warning
[ 0.000000] timer_sp804: timer clock not found: -517
[ 0.000000] timer_sp804: arm,sp804 clock not found: -2
[ 0.000000] Failed to initialize
'/bus@...0000/motherboard-bus@...0000/iofpga-bus@...000000/timer@...000':
-22
[ 0.000000] timer_sp804: timer clock not found: -517
[ 0.000000] timer_sp804: arm,sp804 clock not found: -2
[ 0.000000] Failed to initialize
'/bus@...0000/motherboard-bus@...0000/iofpga-bus@...000000/timer@...000':
-22
[ 0.000000] arch_timer: frequency not available
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/time/clockevents.c:38
cev_delta2ns (kernel/time/clockevents.c:38 (discriminator 1))
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted
6.15.0-next-20250605 #1 PREEMPT
[ 0.000000] Hardware name: ARM Juno development board (r2) (DT)
[ 0.000000] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 0.000000] pc : cev_delta2ns (kernel/time/clockevents.c:38
(discriminator 1))
[ 0.000000] lr : clockevents_config.part.0 (kernel/time/clockevents.c:499)
[ 0.000000] sp : ffff800082923cd0
[ 0.000000] x29: ffff800082923cd0 x28: 0000000000000400 x27: ffff800081650000
[ 0.000000] x26: ffff80008292fcc0 x25: ffff800082425888 x24: ffff8000829343c0
[ 0.000000] x23: ffff800083210000 x22: 000000000000000b x21: ffff8000823cf178
[ 0.000000] x20: ffff800082433880 x19: ffff00080021e240 x18: 0000000000000000
[ 0.000000] x17: ffff00080021a400 x16: ffff00080021a200 x15: 0000000000000100
[ 0.000000] x14: fffffdffe0008a00 x13: ffff800080000000 x12: 0000000000000000
[ 0.000000] x11: 0000000000000068 x10: 0000000000000100 x9 : ffff8000801b50f8
[ 0.000000] x8 : 000000001dcd6500 x7 : 000000003b9aca00 x6 : 0000000000000020
[ 0.000000] x5 : 0000000000000020 x4 : 0000000000000000 x3 : 0000000f00000000
[ 0.000000] x2 : 0000000000000000 x1 : ffff00080021e240 x0 : 000000000000000f
[ 0.000000] Call trace:
[ 0.000000] cev_delta2ns (kernel/time/clockevents.c:38 (discriminator 1)) (P)
[ 0.000000] clockevents_config_and_register (kernel/time/clockevents.c:519)
[ 0.000000] arch_timer_mem_frame_register
(drivers/clocksource/arm_arch_timer.c:1319
drivers/clocksource/arm_arch_timer.c:1580)
[ 0.000000] arch_timer_mem_of_init
(drivers/clocksource/arm_arch_timer.c:1653)
[ 0.000000] timer_probe (drivers/clocksource/timer-probe.c:31)
[ 0.000000] time_init (arch/arm64/kernel/time.c:62)
[ 0.000000] start_kernel (init/main.c:1014)
[ 0.000000] __primary_switched (arch/arm64/kernel/head.S:247)
[ 0.000000] ---[ end trace 0000000000000000 ]---
[ 0.000000] arch_timer: cp15 and mmio timer(s) running at 50.00MHz
(phys/phys).
## Source
* Kernel version: 6.15.0-next-20250513 to 6.15.0-next-20250606
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git sha: 4f27f06ec12190c7c62c722e99ab6243dea81a94
* Toolchain: gcc-13
## Boot details
* Boot lava log: https://lkft.validation.linaro.org/scheduler/job/8309469#L622
* Boot log: https://qa-reports.linaro.org/api/testruns/28679128/log_file/
* Boot warning:
https://regressions.linaro.org/lkft/linux-next-master/next-20250605/log-parser-boot/exception-warning-cpu-pid-at-kerneltimeclockevents-cev_delta2ns/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2y4wgEvmeoVH3Vr528M4YN2OBXY/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2y4wgEvmeoVH3Vr528M4YN2OBXY/config
--
Linaro LKFT
https://lkft.linaro.org
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