linux-kernel - Re: [RFC PATCH 1/4] acpi: change the topo of acpi_table

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Date:   Mon, 7 Jan 2019 11:55:48 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     "the arch/x86 maintainers" <x86@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/4] acpi: change the topo of acpi_table_upgrade()

On Mon, Jan 7, 2019 at 9:25 AM Pingfan Liu <kernelfans@...il.com> wrote:
>
> The current acpi_table_upgrade() relies on initrd_start, but this var is
> only valid after relocate_initrd(). There is requirement to extract the
> acpi info from initrd before memblock-allocator can work(see [2/4]), hence
> acpi_table_upgrade() need to accept the input param directly.
>
> Signed-off-by: Pingfan Liu <kernelfans@...il.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-kernel@...r.kernel.org

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  arch/arm64/kernel/setup.c | 2 +-
>  arch/x86/kernel/setup.c   | 2 +-
>  drivers/acpi/tables.c     | 4 +---
>  include/linux/acpi.h      | 4 ++--
>  4 files changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index 4b0e123..48cb98c 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -315,7 +315,7 @@ void __init setup_arch(char **cmdline_p)
>         paging_init();
>         efi_apply_persistent_mem_reservations();
>
> -       acpi_table_upgrade();
> +       acpi_table_upgrade((void *)initrd_start, initrd_end - initrd_start);
>
>         /* Parse the ACPI tables for possible boot-time configuration */
>         acpi_boot_table_init();
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 3d872a5..acbcd62 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1175,8 +1175,8 @@ void __init setup_arch(char **cmdline_p)
>
>         reserve_initrd();
>
> -       acpi_table_upgrade();
>
> +       acpi_table_upgrade((void *)initrd_start, initrd_end - initrd_start);
>         vsmp_init();
>
>         io_delay_init();
> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> index 48eabb6..d29b05c 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -471,10 +471,8 @@ static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
>
>  #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
>
> -void __init acpi_table_upgrade(void)
> +void __init acpi_table_upgrade(void *data, size_t size)
>  {
> -       void *data = (void *)initrd_start;
> -       size_t size = initrd_end - initrd_start;
>         int sig, no, table_nr = 0, total_offset = 0;
>         long offset = 0;
>         struct acpi_table_header *table;
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 87715f2..44dcbba 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -1272,9 +1272,9 @@ acpi_graph_get_remote_endpoint(const struct fwnode_handle *fwnode,
>  #endif
>
>  #ifdef CONFIG_ACPI_TABLE_UPGRADE
> -void acpi_table_upgrade(void);
> +void acpi_table_upgrade(void *data, size_t size);
>  #else
> -static inline void acpi_table_upgrade(void) { }
> +static inline void acpi_table_upgrade(void *data, size_t size) { }
>  #endif
>
>  #if defined(CONFIG_ACPI) && defined(CONFIG_ACPI_WATCHDOG)
> --
> 2.7.4
>