diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index a735d9e229dde..23085e665faac 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -91,8 +91,7 @@ void __init housekeeping_init(void) static int __init housekeeping_setup(char *str, enum hk_flags flags) { - cpumask_var_t non_housekeeping_mask; - cpumask_var_t tmp; + cpumask_var_t non_housekeeping_mask, housekeeping_staging; alloc_bootmem_cpumask_var(&non_housekeeping_mask); if (cpulist_parse(str, non_housekeeping_mask) < 0) { @@ -101,32 +100,32 @@ static int __init housekeeping_setup(char *str, enum hk_flags flags) return 0; } - alloc_bootmem_cpumask_var(&tmp); - if (!housekeeping_flags) { - alloc_bootmem_cpumask_var(&housekeeping_mask); - cpumask_andnot(housekeeping_mask, - cpu_possible_mask, non_housekeeping_mask); + alloc_bootmem_cpumask_var(&housekeeping_staging); + cpumask_andnot(housekeeping_staging, + cpu_possible_mask, non_housekeeping_mask); - cpumask_andnot(tmp, cpu_present_mask, non_housekeeping_mask); - if (cpumask_empty(tmp)) { + if (!cpumask_intersects(cpu_present_mask, housekeeping_staging)) { + __cpumask_set_cpu(smp_processor_id(), housekeeping_staging); + __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask); + if (!housekeeping_flags) { pr_warn("Housekeeping: must include one present CPU, " "using boot CPU:%d\n", smp_processor_id()); - __cpumask_set_cpu(smp_processor_id(), housekeeping_mask); - __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask); } + } + + if (!housekeeping_flags) { + alloc_bootmem_cpumask_var(&housekeeping_mask); + cpumask_copy(housekeeping_mask, housekeeping_staging); } else { - cpumask_andnot(tmp, cpu_present_mask, non_housekeeping_mask); - if (cpumask_empty(tmp)) - __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask); - cpumask_andnot(tmp, cpu_possible_mask, non_housekeeping_mask); - if (!cpumask_equal(tmp, housekeeping_mask)) { + if (!cpumask_equal(housekeeping_staging, housekeeping_mask)) { pr_warn("Housekeeping: nohz_full= must match isolcpus=\n"); - free_bootmem_cpumask_var(tmp); + free_bootmem_cpumask_var(housekeeping_staging); free_bootmem_cpumask_var(non_housekeeping_mask); return 0; } } - free_bootmem_cpumask_var(tmp); + + free_bootmem_cpumask_var(housekeeping_staging); if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK)) { if (IS_ENABLED(CONFIG_NO_HZ_FULL)) {