[PATCH v4] 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 and
riscv can utillize this to insert their arch-specific flow. In
the future, other architectures can also have chance to define
their own arch-specific acpi initialization process if necessary.

Reviewed-by: Sunil V L <sunilvl at ventanamicro.com>
Reviewed-by: Sudeep Holla <sudeep.holla at arm.com>
Acked-by: Hanjun Guo <guohanjun at huawei.com>
Signed-off-by: Miao Wang <shankerwangmiao at gmail.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
---
Changes in v4:
- Rebased to recent Linus's tree
- Consolidate acpi_arm_init and acpi_riscv_init into acpi_arch_init
- Link to v3: https://lore.kernel.org/r/20240808-intro-acpi-arch-init-v3-1-ba510859baff@gmail.com
---
 drivers/acpi/arm64/init.c |  2 +-
 drivers/acpi/bus.c        |  5 +++--
 drivers/acpi/riscv/init.c |  2 +-
 include/linux/acpi.h      | 12 +-----------
 4 files changed, 6 insertions(+), 15 deletions(-)

diff --git a/drivers/acpi/arm64/init.c b/drivers/acpi/arm64/init.c
index d0c8aed90fd16f9a7fe62b8c551c0cd091cb91ec..7a47d8095a7dd5f3dac6e0754d6271bf6de269ff 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 16917dc3ad604cc537d05bb2c0034ff5a9181fd0..058910af82bca689577909e8967073ca3198b3c8 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1434,6 +1434,8 @@ 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;
@@ -1461,8 +1463,7 @@ static int __init acpi_init(void)
 	acpi_viot_early_init();
 	acpi_hest_init();
 	acpi_ghes_init();
-	acpi_arm_init();
-	acpi_riscv_init();
+	acpi_arch_init();
 	acpi_scan_init();
 	acpi_ec_init();
 	acpi_debugfs_init();
diff --git a/drivers/acpi/riscv/init.c b/drivers/acpi/riscv/init.c
index 5ef97905a72759ea2aab3195e56b7ee580eded96..673e4d5dd752719ae7ed0017c8b5b1c688cf9b4b 100644
--- a/drivers/acpi/riscv/init.c
+++ b/drivers/acpi/riscv/init.c
@@ -7,7 +7,7 @@
 #include <linux/acpi.h>
 #include "init.h"
 
-void __init acpi_riscv_init(void)
+void __init acpi_arch_init(void)
 {
 	riscv_acpi_init_gsi_mapping();
 }
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 7dd24acd9ffeedbe47ac392bd939309408c0afa3..05f39fbfa4856d2e6b7d45d9580cc82963764d55 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1530,17 +1530,7 @@ 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
-
-#ifdef CONFIG_RISCV
-void acpi_riscv_init(void);
-#else
-static inline void acpi_riscv_init(void) { }
-#endif
+void acpi_arch_init(void);
 
 #ifdef CONFIG_ACPI_PCC
 void acpi_init_pcc(void);

---
base-commit: 43fb83c17ba2d63dfb798f0be7453ed55ca3f9c2
change-id: 20240807-intro-acpi-arch-init-fc99fe33e62d

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