[PATCH v4] ACPI: introduce acpi_arch_init

[Rafael J. Wysocki]

On Thu, Nov 21, 2024 at 3:25 PM Miao Wang via B4 Relay
<devnull+shankerwangmiao.gmail.com at kernel.org> wrote:
>
> 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);
>
> ---

Applied as 6.13-rc material, thanks!