linux-kernel - Re: [PATCH v2 3/5] riscv: mm: init: remove _pt_ops and use pt

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Message-ID: <3387fdfb-a82f-6842-5442-c4bc98b745b6@ghiti.fr>
Date:   Thu, 16 Dec 2021 12:09:50 +0100
From:   Alexandre ghiti <alex@...ti.fr>
To:     Jisheng Zhang <jszhang@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] riscv: mm: init: remove _pt_ops and use pt_ops
 directly

On 12/6/21 16:03, Jisheng Zhang wrote:
> Except "pt_ops", other global vars when CONFIG_XIP_KERNEL=y is defined
> as below:
>
> |foo_type foo;
> |#ifdef CONFIG_XIP_KERNEL
> |#define foo	(*(foo_type *)XIP_FIXUP(&foo))
> |#endif
>
> Follow the same way for pt_ops to unify the style and to simplify code.
>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>   arch/riscv/mm/init.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 4edf5600bea9..9c5816971f40 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -227,12 +227,10 @@ static void __init setup_bootmem(void)
>   }
>   
>   #ifdef CONFIG_MMU
> -static struct pt_alloc_ops _pt_ops __initdata;
> +static struct pt_alloc_ops pt_ops __initdata;
>   
>   #ifdef CONFIG_XIP_KERNEL
> -#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
> -#else
> -#define pt_ops _pt_ops
> +#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
>   #endif


I tried to compile a XIP kernel with success and I noticed we can go 
even further by removing the ifdef CONFIG_XIP_KERNEL since XIP_FIXUP is 
the identity for normal kernels.

Anyway, I'll do that later:

Reviewed-by: Alexandre Ghiti <alex@...ti.fr>

Thanks,

Alex


>   
>   unsigned long riscv_pfn_base __ro_after_init;