[RFC PATCH v5 4/8] ACPI, PCI: avoid building pci_slot as module

[Jiang Liu <liuj97@gmail.com>]

As discussed in thread at https://patchwork.kernel.org/patch/1946851/,
there's no value in supporting CONFIG_ACPI_PCI_SLOT=m any more.
So change Kconfig and code to only support building pci_slot as
built-in driver.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 drivers/acpi/Kconfig    |    5 +----
 drivers/acpi/internal.h |    5 +++++
 drivers/acpi/pci_slot.c |   13 +------------
 drivers/acpi/scan.c     |    1 +
 4 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 0300bf6..7efd0d0 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -299,7 +299,7 @@ config ACPI_DEBUG_FUNC_TRACE
 	  is about half of the penalty and is rarely useful.
 
 config ACPI_PCI_SLOT
-	tristate "PCI slot detection driver"
+	bool "PCI slot detection driver"
 	depends on SYSFS
 	default n
 	help
@@ -308,9 +308,6 @@ config ACPI_PCI_SLOT
 	  i.e., segment/bus/device/function tuples, with physical slots in
 	  the system.  If you are unsure, say N.
 
-	  To compile this driver as a module, choose M here:
-	  the module will be called pci_slot.
-
 config X86_PM_TIMER
 	bool "Power Management Timer Support" if EXPERT
 	depends on X86
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index e050254..7374cfc 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -67,6 +67,11 @@ struct acpi_ec {
 
 extern struct acpi_ec *first_ec;
 
+#ifdef	CONFIG_ACPI_PCI_SLOT
+void acpi_pci_slot_init(void);
+#else
+static inline void acpi_pci_slot_init(void) { }
+#endif
 int acpi_pci_root_init(void);
 int acpi_ec_init(void);
 int acpi_ec_ecdt_probe(void);
diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index d22585f..a7d7e77 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -330,19 +330,8 @@ static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
 	{}
 };
 
-static int __init
-acpi_pci_slot_init(void)
+void __init acpi_pci_slot_init(void)
 {
 	dmi_check_system(acpi_pci_slot_dmi_table);
 	acpi_pci_register_driver(&acpi_pci_slot_driver);
-	return 0;
 }
-
-static void __exit
-acpi_pci_slot_exit(void)
-{
-	acpi_pci_unregister_driver(&acpi_pci_slot_driver);
-}
-
-module_init(acpi_pci_slot_init);
-module_exit(acpi_pci_slot_exit);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index f8a0d0f..cb964ac 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1732,6 +1732,7 @@ int __init acpi_scan_init(void)
 
 	acpi_power_init();
 	acpi_pci_root_init();
+	acpi_pci_slot_init();
 
 	/*
 	 * Enumerate devices in the ACPI namespace.
-- 
1.7.9.5