Re: [PATCH] sh: fix fallout from ZERO_PAGE consolidation

[Artur Rojek <contact@artur-rojek.eu>]

On 2026-04-17 12:32, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
> 
> Consolidation of empty_zero_page declarations broke boot on sh.
> 
> sh stores its initial boot parameters in a page reserved in
> arch/sh/kernel/head_32.S. Before commit 6215d9f4470f ("arch, mm:
> consolidate empty_zero_page") this page was referenced in C code as an
> array and after that commit it is referenced as a pointer.
> 
> This causes wrong code generation and boot hang.
> 
> Declare boot_params_page as an array to fix the issue.
> 
> Reported-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> Tested-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> Fixes: 6215d9f4470f ("arch, mm: consolidate empty_zero_page")
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

I confirm this fixes boot issues on SEGA Dreamcast (sh4).

Tested-by: Artur Rojek <contact@artur-rojek.eu>

> ---
>  arch/sh/include/asm/setup.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 
> base-commit: 43cfbdda5af60ffc6272a7b8c5c37d1d0a181ca9
> 
> diff --git a/arch/sh/include/asm/setup.h b/arch/sh/include/asm/setup.h
> index 63c9efc06348..8488f76b48b4 100644
> --- a/arch/sh/include/asm/setup.h
> +++ b/arch/sh/include/asm/setup.h
> @@ -7,7 +7,7 @@
>  /*
>   * This is set up by the setup-routine at boot-time
>   */
> -extern unsigned char *boot_params_page;
> +extern unsigned char boot_params_page[];
>  #define PARAM boot_params_page
> 
>  #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))