linux-kernel - [PATCH v2 2/8] ARM: cpuidle: Remove overzealous error logging

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Message-Id: <bfaea706699cd51341ef1870bc485c8554ebb0be.1565348376.git.lorenzo.pieralisi@arm.com>
Date:   Fri,  9 Aug 2019 12:03:08 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     linux-pm@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 2/8] ARM: cpuidle: Remove overzealous error logging

CPUidle back-end operations are not implemented in some platforms
but this should not be considered an error serious enough to be
logged. Check the arm_cpuidle_init() return value to detect whether
the failure must be reported or not in the kernel log and do
not log it if the platform does not support CPUidle operations.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@....com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
---
 drivers/cpuidle/cpuidle-arm.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index dc33b3d2954f..9e5156d39627 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -105,11 +105,17 @@ static int __init arm_idle_init_cpu(int cpu)
 	ret = arm_cpuidle_init(cpu);
 
 	/*
-	 * Allow the initialization to continue for other CPUs, if the reported
-	 * failure is a HW misconfiguration/breakage (-ENXIO).
+	 * Allow the initialization to continue for other CPUs, if the
+	 * reported failure is a HW misconfiguration/breakage (-ENXIO).
+	 *
+	 * Some platforms do not support idle operations
+	 * (arm_cpuidle_init() returning -EOPNOTSUPP), we should
+	 * not flag this case as an error, it is a valid
+	 * configuration.
 	 */
 	if (ret) {
-		pr_err("CPU %d failed to init idle CPU ops\n", cpu);
+		if (ret != -EOPNOTSUPP)
+			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
 		ret = ret == -ENXIO ? 0 : ret;
 		goto out_kfree_drv;
 	}
-- 
2.21.0