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Code Issues Releases Wiki Activity

cpufreq: ondemand: Use cpumask_var_t for on-stack cpu mask 

A cpumask structure on the stack can cause a warning with
CONFIG_NR_CPUS=8192 (e.g. Ubuntu 22.04 uses this):

drivers/cpufreq/cpufreq_ondemand.c: In function 'od_set_powersave_bias':
drivers/cpufreq/cpufreq_ondemand.c:449:1: warning: the frame size of
	1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
  449 | }
      | ^

CONFIG_CPUMASK_OFFSTACK=y is enabled by default for most distros, and
hence we can work around the warning by using cpumask_var_t.

Signed-off-by: Zhao Liu <zhao1.liu@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhao Liu 2022-07-22 10:50:24 +08:00 committed by Rafael J. Wysocki
parent 9d822ccf33
commit 3e5c04f97c
1 changed files with 9 additions and 4 deletions
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13
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -416,10 +416,13 @@ static struct dbs_governor od_dbs_gov = {
static void od_set_powersave_bias(unsigned int powersave_bias)
{
unsigned int cpu;
cpumask_t done;
cpumask_var_t done;
if (!alloc_cpumask_var(&done, GFP_KERNEL))
return;
default_powersave_bias = powersave_bias;
cpumask_clear(&done);
cpumask_clear(done);
cpus_read_lock();
for_each_online_cpu(cpu) {
@ -428,7 +431,7 @@ static void od_set_powersave_bias(unsigned int powersave_bias)
struct dbs_data *dbs_data;
struct od_dbs_tuners *od_tuners;
if (cpumask_test_cpu(cpu, &done))
if (cpumask_test_cpu(cpu, done))
continue;
policy = cpufreq_cpu_get_raw(cpu);
@ -439,13 +442,15 @@ static void od_set_powersave_bias(unsigned int powersave_bias)
if (!policy_dbs)
continue;
cpumask_or(&done, &done, policy->cpus);
cpumask_or(done, done, policy->cpus);
dbs_data = policy_dbs->dbs_data;
od_tuners = dbs_data->tuners;
od_tuners->powersave_bias = default_powersave_bias;
}
cpus_read_unlock();
free_cpumask_var(done);
}
void od_register_powersave_bias_handler(unsigned int (*f)