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cpuidle: 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_first_and_and() and 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: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20240416085454.3547175-8-dawei.li@shingroup.cn
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@ -439,13 +439,8 @@ static int cpuidle_coupled_clear_pokes(int cpu)
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static bool cpuidle_coupled_any_pokes_pending(struct cpuidle_coupled *coupled)
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{
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cpumask_t cpus;
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int ret;
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cpumask_and(&cpus, cpu_online_mask, &coupled->coupled_cpus);
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ret = cpumask_and(&cpus, &cpuidle_coupled_poke_pending, &cpus);
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return ret;
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return cpumask_first_and_and(cpu_online_mask, &coupled->coupled_cpus,
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&cpuidle_coupled_poke_pending) < nr_cpu_ids;
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}
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/**
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@ -626,9 +621,7 @@ out:
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static void cpuidle_coupled_update_online_cpus(struct cpuidle_coupled *coupled)
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{
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cpumask_t cpus;
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cpumask_and(&cpus, cpu_online_mask, &coupled->coupled_cpus);
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coupled->online_count = cpumask_weight(&cpus);
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coupled->online_count = cpumask_weight_and(cpu_online_mask, &coupled->coupled_cpus);
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}
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/**
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