linux-kernel - Re: [PATCH 21/24] RISC-V: ACPI: Add ACPI initialization in setup

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Date:   Thu, 9 Feb 2023 21:53:59 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>
Subject: Re: [PATCH 21/24] RISC-V: ACPI: Add ACPI initialization in
 setup_arch()

On Mon, Jan 30, 2023 at 11:52:22PM +0530, Sunil V L wrote:
> Initialize ACPI tables for RISC-V during boot.
> 
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  arch/riscv/kernel/setup.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 4335f08ffaf2..5b4ad1baf664 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -8,6 +8,7 @@
>   *  Nick Kossifidis <mick@....forth.gr>
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/init.h>
>  #include <linux/mm.h>
>  #include <linux/memblock.h>
> @@ -276,14 +277,22 @@ void __init setup_arch(char **cmdline_p)
>  
>  	efi_init();
>  	paging_init();
> +
> +	/* Parse the ACPI tables for possible boot-time configuration */
> +	acpi_boot_table_init();
> +	if (acpi_disabled) {
>  #if IS_ENABLED(CONFIG_BUILTIN_DTB)

I only poked it with a stick, but I think this `#if IS_ENABLED()` can
be changed to a normal `if (IS_ENABLED())` while you're already
modifying this code.

> -	unflatten_and_copy_device_tree();
> +		unflatten_and_copy_device_tree();
>  #else
> -	if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
> -		unflatten_device_tree();
> -	else
> -		pr_err("No DTB found in kernel mappings\n");
> +		if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
> +			unflatten_device_tree();
> +		else
> +			pr_err("No DTB found in kernel mappings\n");
>  #endif
> +	} else {
> +		early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa)));
> +	}
> +
>  	early_init_fdt_scan_reserved_mem();
>  	misc_mem_init();
>  
> -- 
> 2.38.0
> 

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