ACPI / PCI: Make pci_slot built-in only, not a module

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>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

4 files changed, 8 insertions, 16 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 38c5078da11d..27fde5e8d31a 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -308,7 +308,7 @@ 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
@@ -317,9 +317,6 @@ 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 e050254ae143..7374cfc5917a 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 d22585f21aeb..a7d7e7710f9e 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 7c43bdc36abc..236e476b09c9 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1687,6 +1687,7 @@ int __init acpi_scan_init(void)
 
         acpi_power_init();
         acpi_pci_root_init();
+        acpi_pci_slot_init();
 
         /*
          * Enumerate devices in the ACPI namespace.