linux-kernel - [PATCH] cpufreq: dt: always allocate zeroed cpumask

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Date: Thu, 14 Mar 2024 13:54:57 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>, "Rafael J. Wysocki"
	<rafael@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>, Stephan Gerhold
	<stephan@...hold.net>, Catalin Marinas <catalin.marinas@....com>, Russell
	King <linux@...linux.org.uk>, Christoph Lameter <cl@...two.org>, Mark
	Rutland <mark.rutland@....com>, Sudeep Holla <sudeep.holla@....com>, Will
	Deacon <will@...nel.org>, stable@...r.kernel.org
Subject: [PATCH] cpufreq: dt: always allocate zeroed cpumask

Commit 0499a78369ad ("ARM64: Dynamically allocate cpumasks and increase
supported CPUs to 512") changed the handling of cpumasks on ARM 64bit,
what resulted in the strange issues and warnings during cpufreq-dt
initialization on some big.LITTLE platforms.

This was caused by mixing OPPs between big and LITTLE cores, because
OPP-sharing information between big and LITTLE cores is computed on
cpumask, which in turn was not zeroed on allocation. Fix this by
switching to zalloc_cpumask_var() call.

Fixes: dc279ac6e5b4 ("cpufreq: dt: Refactor initialization to handle probe deferral properly")
CC: stable@...r.kernel.org # v5.10+
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/cpufreq/cpufreq-dt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 8bd6e5e8f121..2d83bbc65dd0 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -208,7 +208,7 @@ static int dt_cpufreq_early_init(struct device *dev, int cpu)
 	if (!priv)
 		return -ENOMEM;
 
-	if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL))
+	if (!zalloc_cpumask_var(&priv->cpus, GFP_KERNEL))
 		return -ENOMEM;
 
 	cpumask_set_cpu(cpu, priv->cpus);
-- 
2.34.1