The commit a6e4491c682a ("sched/isolcpus: Output warning when the
'isolcpus=' kernel parameter is invalid") adds an error message
when specified cpu bigger than nr_cpu_ids, but nr_cpumask_bits in
cpulist_parse() could be nr_cpu_ids or NR_CPUS.eg, NR_CPUS=64, nr_cpu_ids=8 in ARM64, cpulist_parse() won't return -ERANGE if isolcpus=1-10; Let's show the isolated cpu map and drop the improper error message. Cc: Prarit Bhargava <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Ingo Molnar <[email protected]> Signed-off-by: Kefeng Wang <[email protected]> --- kernel/sched/core.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c56fb57..13a122d 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6076,13 +6076,16 @@ static void update_top_cache_domain(int cpu) /* Setup the mask of cpus configured for isolated domains */ static int __init isolated_cpu_setup(char *str) { - int ret; + int cpu; alloc_bootmem_cpumask_var(&cpu_isolated_map); - ret = cpulist_parse(str, cpu_isolated_map); - if (ret) { - pr_err("sched: Error, all isolcpus= values must be between 0 and %d\n", nr_cpu_ids); - return 0; + cpulist_parse(str, cpu_isolated_map); + + if (!cpumask_empty(cpu_isolated_map)) { + pr_cont("sched: isolated cpus [ "); + for_each_cpu(cpu, cpu_isolated_map) + pr_cont("%d ", cpu); + pr_cont("]\n"); } return 1; } -- 1.7.12.4
