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 make a minor change about message when total number
of cpu exceeds the limit.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reported-by: Shiyuan Hu <hushiyuan@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 76a6d92..d93d433 100644 (file)
--- 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("Number of cores (%d) exceeds configured maximum of %d - clipping\n",
+                       cpu_count, nr_cpu_ids);
 
        if (!bootcpu_valid) {
                pr_err("missing boot CPU MPIDR, not enabling secondaries\n");
@@ -677,7 +677,7 @@ void __init smp_init_cpus(void)
         * with entries in cpu_logical_map while initializing the cpus.
         * If the cpu set-up fails, invalidate the cpu_logical_map entry.
         */
-       for (i = 1; i < NR_CPUS; i++) {
+       for (i = 1; i < nr_cpu_ids; i++) {
                if (cpu_logical_map(i) != INVALID_HWID) {
                        if (smp_cpu_setup(i))
                                cpu_logical_map(i) = INVALID_HWID;