linux-kernel - Re: [PATCH 05/24] RISC-V: ACPI: Add basic functions to build ACPI core

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Date:   Wed, 8 Feb 2023 20:58:31 +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 05/24] RISC-V: ACPI: Add basic functions to build ACPI
 core

On Mon, Jan 30, 2023 at 11:52:06PM +0530, Sunil V L wrote:
> Introduce acpi.c and its related header files to provide
> fundamental needs of extern variables and functions for ACPI core.
> 	- asm/acpi.h for arch specific variables and functions needed by
> 	  ACPI driver core;
> 	- acpi.c - Add function to initialize ACPI tables.
> 	- acpi.c for RISC-V related ACPI implementation for ACPI driver
> 	  core;
> 
> Code is mostly leveraged from ARM64.



> diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c

> + * __acpi_map_table() will be called before page_init(), so early_ioremap()

rg "\bpage_init\("
arch/riscv/kernel/acpi.c
54: * __acpi_map_table() will be called before page_init(), so early_ioremap()

arch/arm64/kernel/acpi.c
86: * __acpi_map_table() will be called before page_init(), so early_ioremap()

This function doesn't appear to exist, perhaps what you are looking for is
paging_init()?

> + * or early_memremap() should be called here to for ACPI table mapping.
> + */
> +void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
> +{
> +	if (!size)
> +		return NULL;
> +
> +	return early_memremap(phys, size);
> +}

> +void __init acpi_boot_table_init(void)
> +{
> +	/*
> +	 * Enable ACPI instead of device tree unless
> +	 * - ACPI has been disabled explicitly (acpi=off), or
> +	 * - firmware has not populated ACPI ptr in EFI system table
> +	 */
> +
> +	if (param_acpi_off || (efi.acpi20 == EFI_INVALID_TABLE_ADDR))

There's an extraneous set of () around the second item here.

> +		goto done;
> +	/*

A small nit: a newline before opening the comment block here please!

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