linux-kernel - Re: [PATCH v2 2/6] RISC-V: Initialize SBI early

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Message-ID: <20201027100427.GL1154158@kernel.org>
Date:   Tue, 27 Oct 2020 12:04:27 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Ard Biesheuvel <ardb@...nel.org>, Borislav Petkov <bp@...e.de>,
        Greentime Hu <greentime.hu@...ive.com>,
        Kees Cook <keescook@...omium.org>,
        linux-riscv@...ts.infradead.org,
        Michel Lespinasse <walken@...gle.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH v2 2/6] RISC-V: Initialize SBI early

On Mon, Oct 26, 2020 at 04:02:50PM -0700, Atish Patra wrote:
> Currently, SBI is initialized towards the end of arch setup. This prevents
> the set memory operations to be invoked earlier as it requires a full tlb
> flush.
> 
> Initialize SBI as early as possible.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
>  arch/riscv/kernel/setup.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index c424cc6dd833..7d6a04ae3929 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -89,6 +89,9 @@ void __init setup_arch(char **cmdline_p)
>  		pr_err("No DTB found in kernel mappings\n");
>  #endif
>  
> +#if IS_ENABLED(CONFIG_RISCV_SBI)

Maybe
	if (IS_ENABLED(CONFIG_RISCV_SBI))
		sbi_init()

> +	sbi_init();
> +#endif
>  #ifdef CONFIG_SWIOTLB
>  	swiotlb_init(1);
>  #endif
> @@ -97,10 +100,6 @@ void __init setup_arch(char **cmdline_p)
>  	kasan_init();
>  #endif
>  
> -#if IS_ENABLED(CONFIG_RISCV_SBI)
> -	sbi_init();
> -#endif
> -
>  #ifdef CONFIG_SMP
>  	setup_smp();
>  #endif
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.