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powercap: DTPM: Avoid explicit cpumask allocation on stack 

In general it's preferable to avoid placing cpumasks on the stack, as
for large values of NR_CPUS these can consume significant amounts of
stack space and make stack overflows more likely.

Use cpumask_weight_and() to avoid the need for a temporary cpumask on
the stack.

Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dawei Li 2024-04-15 17:48:21 +08:00 committed by Rafael J. Wysocki
parent 0bbac3facb
commit 0654acd8eb
1 changed files with 2 additions and 6 deletions
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8
drivers/powercap/dtpm_cpu.c
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@ -43,13 +43,11 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit)
struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm);
struct em_perf_domain *pd = em_cpu_get(dtpm_cpu->cpu);
struct em_perf_state *table;
struct cpumask cpus;
unsigned long freq;
u64 power;
int i, nr_cpus;
cpumask_and(&cpus, cpu_online_mask, to_cpumask(pd->cpus));
nr_cpus = cpumask_weight(&cpus);
nr_cpus = cpumask_weight_and(cpu_online_mask, to_cpumask(pd->cpus));
rcu_read_lock();
table = em_perf_state_from_pd(pd);
@ -123,11 +121,9 @@ static int update_pd_power_uw(struct dtpm *dtpm)
struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm);
struct em_perf_domain *em = em_cpu_get(dtpm_cpu->cpu);
struct em_perf_state *table;
struct cpumask cpus;
int nr_cpus;
cpumask_and(&cpus, cpu_online_mask, to_cpumask(em->cpus));
nr_cpus = cpumask_weight(&cpus);
nr_cpus = cpumask_weight_and(cpu_online_mask, to_cpumask(em->cpus));
rcu_read_lock();
table = em_perf_state_from_pd(em);