cpufreq: dt: always allocate zeroed cpumask

[ Upstream commit d239950 ]

Commit 0499a78 ("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: dc279ac ("cpufreq: dt: Refactor initialization to handle probe deferral properly")
CC: [email protected] # v5.10+
Signed-off-by: Marek Szyprowski <[email protected]>
Reviewed-by: Christoph Lameter (Ampere) <[email protected]>
Reviewed-by: Dhruva Gole <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

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);