linux-kernel - [PATCH] arm64: topology: Do not warn on missing AMU in cpuhp_topology

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Message-ID: <a8dbf49bfa44a6809fa4f34b918516847dc14460.1768466986.git.geert+renesas@glider.be>
Date: Thu, 15 Jan 2026 09:51:45 +0100
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Lifeng Zheng <zhenglifeng1@...wei.com>,
	Beata Michalska <beata.michalska@....com>,
	Will Deacon <will@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] arm64: topology: Do not warn on missing AMU in cpuhp_topology_online()

When CONFIG_CPUMASK_OFFSTACK is not enabled, and resuming from s2ram on
Renesas R-Car H3 (big.LITTLE 4x Cortex-A57 + 4x Cortex-A53), during
enabling of the first little core, a warning message is printed:

    AMU: CPU[4] doesn't support AMU counters

This confuses users, as during boot amu_fie_setup() does not print such
a message, unless debugging is enabled (freq_counters_valid() prints
"CPU%d: counters are not supported.\n" at debug level in that case).

Hence drop the warning, freq_counters_valid() has already printed a
debug message anyway.

Fixes: 6fd9be0b7b2e957d ("arm64: topology: Handle AMU FIE setup on CPU hotplug")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 arch/arm64/kernel/topology.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 539b3893518281ec..3fe1faab03620e78 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -332,7 +332,6 @@ static int cpuhp_topology_online(unsigned int cpu)
 	 * may use different source of the freq scale.
 	 */
 	if (!freq_counters_valid(cpu)) {
-		pr_warn("CPU[%u] doesn't support AMU counters\n", cpu);
 		topology_clear_scale_freq_source(SCALE_FREQ_SOURCE_ARCH,
 						 policy->related_cpus);
 		cpumask_andnot(amu_fie_cpus, amu_fie_cpus, policy->related_cpus);
-- 
2.43.0