[PATCH v2] arm64: Support hard limit of cpu count by nr_cpus

[Suzuki K Poulose]

On 08/08/16 07:05, Kefeng Wang wrote:
> Enable the hard limit of cpu count by set boot options nr_cpus=x
> on arm64, and show a better warning when cpu number exceeds the limit.
>
> Reported-by: Shiyuan Hu <hushiyuan at huawei.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
>
> Changed since v1:
> - clip cpu number in smp_init_cpus suggested-by Will and Suzuki, and update
>   the warning.
>
>  arch/arm64/kernel/smp.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 76a6d92..cbfc31c 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -661,9 +661,9 @@ void __init smp_init_cpus(void)
>  		acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
>  				      acpi_parse_gic_cpu_interface, 0);
>
> -	if (cpu_count > NR_CPUS)
> -		pr_warn("no. of cores (%d) greater than configured maximum of %d - clipping\n",
> -			cpu_count, NR_CPUS);
> +	if (cpu_count > nr_cpu_ids)
> +		pr_warn("%d cores exceeds configured maximum of %d - clipping\n",
> +			cpu_count, nr_cpu_ids);

I think we should leave the message as it was, and is better than what you have
changed it to.


With that change,

Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>