[PATCH v3] ACPI: introduce acpi_arch_init

[Miao Wang via B4 Relay]

From: Miao Wang <shankerwangmiao at gmail.com>

To avoid arch-specific code in general ACPI initialization flow,
we introduce a weak symbol acpi_arch_init. Currently, arm64 can
utillize this to insert its specific flow. In the future,
other architectures can also have chance to define their own
arch-specific acpi initialization process if necessary.

Signed-off-by: Miao Wang <shankerwangmiao at gmail.com>
Reviewed-by: Sunil V L <sunilvl at ventanamicro.com>
Reviewed-by: Sudeep Holla <sudeep.holla at arm.com>
---
Changes from v1
- Change acpi_arch_init from a static inline stub to a weak function
  according to Haijun Guo's advice
---
Changes from v2:
- Add __init attribute to the weak acpi_arch_init stub
- Link to v2: https://lore.kernel.org/r/20240807-intro-acpi-arch-init-v2-1-9231e23a7721@gmail.com
---
 drivers/acpi/arm64/init.c | 2 +-
 drivers/acpi/bus.c        | 4 +++-
 include/linux/acpi.h      | 6 +-----
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/arm64/init.c b/drivers/acpi/arm64/init.c
index d0c8aed90fd1..7a47d8095a7d 100644
--- a/drivers/acpi/arm64/init.c
+++ b/drivers/acpi/arm64/init.c
@@ -2,7 +2,7 @@
 #include <linux/acpi.h>
 #include "init.h"
 
-void __init acpi_arm_init(void)
+void __init acpi_arch_init(void)
 {
 	if (IS_ENABLED(CONFIG_ACPI_AGDI))
 		acpi_agdi_init();
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 284bc2e03580..3b319b163d82 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1431,6 +1431,8 @@ static int __init acpi_bus_init(void)
 struct kobject *acpi_kobj;
 EXPORT_SYMBOL_GPL(acpi_kobj);
 
+void __weak __init acpi_arch_init(void) { }
+
 static int __init acpi_init(void)
 {
 	int result;
@@ -1458,7 +1460,7 @@ static int __init acpi_init(void)
 	acpi_viot_early_init();
 	acpi_hest_init();
 	acpi_ghes_init();
-	acpi_arm_init();
+	acpi_arch_init();
 	acpi_scan_init();
 	acpi_ec_init();
 	acpi_debugfs_init();
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 0687a442fec7..52862c377747 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1523,11 +1523,7 @@ static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
 }
 #endif
 
-#ifdef CONFIG_ARM64
-void acpi_arm_init(void);
-#else
-static inline void acpi_arm_init(void) { }
-#endif
+void acpi_arch_init(void);
 
 #ifdef CONFIG_ACPI_PCC
 void acpi_init_pcc(void);

---
base-commit: d4560686726f7a357922f300fc81f5964be8df04
change-id: 20240807-intro-acpi-arch-init-fc99fe33e62d

Best regards,
-- 
Miao Wang <shankerwangmiao at gmail.com>