ACPI / processor: Introduce ARCH_MIGHT_HAVE_ACPI_PDC

The use of _PDC is deprecated in ACPI 3.0 in favor of _OSC,
as ARM platform is supported only in ACPI 5.0 or higher version,
_PDC will not be used in ARM platform, so make Make _PDC only for
platforms with Intel CPUs.

Introduce ARCH_MIGHT_HAVE_ACPI_PDC and move _PDC related code in
ACPI processor driver into a single file processor_pdc.c, make x86
and ia64 select it when ACPI is enabled.

This patch also use pr_* to replace printk to fix the checkpatch
warning and factor acpi_processor_alloc_pdc() a little bit to
avoid duplicate pr_err() code.

Suggested-by: Robert Richter <rric@kernel.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 7de5b603f272..64ee3eed18de 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -108,7 +108,12 @@ int acpi_power_transition(struct acpi_device *device, int state);
 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 
 int acpi_wakeup_device_init(void);
+
+#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC
 void acpi_early_processor_set_pdc(void);
+#else
+static inline void acpi_early_processor_set_pdc(void) {}
+#endif
 
 /* --------------------------------------------------------------------------
                                   Embedded Controller