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

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 <redacted>
Signed-off-by: Kefeng Wang <redacted>
---

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);