linux-kernel - Re: [PATCH -fixes v2 2/3] riscv: Do not set initial_boot

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Date:   Wed, 29 Mar 2023 15:37:25 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -fixes v2 2/3] riscv: Do not set initial_boot_params to
 the linear address of the dtb

On Wed, Mar 29, 2023 at 10:19:31AM +0200, Alexandre Ghiti wrote:
> early_init_dt_verify() is already called in parse_dtb() and since the dtb
> address does not change anymore (it is now in the fixmap region), no need
> to reset initial_boot_params by calling early_init_dt_verify() again.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/kernel/setup.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 542eed85ad2c..a059b73f4ddb 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -278,10 +278,7 @@ void __init setup_arch(char **cmdline_p)
>  #if IS_ENABLED(CONFIG_BUILTIN_DTB)
>  	unflatten_and_copy_device_tree();
>  #else
> -	if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
> -		unflatten_device_tree();

Silly question maybe, but since it isn't explicitly mentioned, the
XIP_FIXUP bits no longer matter?
Also, in related news, I assume you don't have a QEMU setup that can do
boot an XIP kernel?

Cheers,
Conor.

> -	else
> -		pr_err("No DTB found in kernel mappings\n");
> +	unflatten_device_tree();
>  #endif
>  	misc_mem_init();
>  
> -- 
> 2.37.2
> 

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