arm64: Declare ACPI parking protocol CPU operation if needed

It's obvious we needn't declare the corresponding CPU operation when
CONFIG_ARM64_ACPI_PARKING_PROTOCOL is disabled, even it doesn't cause
any compiling warnings.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/cpu_ops.c b/arch/arm64/kernel/cpu_ops.c
index 7e07072..2082cfb 100644 (file)
--- a/arch/arm64/kernel/cpu_ops.c
+++ b/arch/arm64/kernel/cpu_ops.c
@@ -15,7 +15,9 @@
 #include <asm/smp_plat.h>
 
 extern const struct cpu_operations smp_spin_table_ops;
+#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
 extern const struct cpu_operations acpi_parking_protocol_ops;
+#endif
 extern const struct cpu_operations cpu_psci_ops;
 
 const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;