linux-kernel - Re: [PATCH 2/4] csky: apply page shift to PFN instead of VA in pfn_to

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Date: Fri, 23 Feb 2024 19:26:20 +0800
From: Guo Ren <guoren@...nel.org>
To: Yan Zhao <yan.y.zhao@...el.com>
Cc: arnd@...db.de, linus.walleij@...aro.org, bcain@...cinc.com, 
	jonas@...thpole.se, stefan.kristiansson@...nalahti.fi, shorne@...il.com, 
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org, 
	linux-openrisc@...r.kernel.org
Subject: Re: [PATCH 2/4] csky: apply page shift to PFN instead of VA in pfn_to_virt

On Wed, Jan 31, 2024 at 2:28 PM Yan Zhao <yan.y.zhao@...el.com> wrote:
>
> Apply the page shift to PFN to get physical address for final VA.
> The macro __va should take physical address instead of PFN as input.
>
> Fixes: c1884e1e1164 ("csky: Make pfn accessors static inlines")
> Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
> ---
>  arch/csky/include/asm/page.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h
> index 4a0502e324a6..2c4cc7825a7b 100644
> --- a/arch/csky/include/asm/page.h
> +++ b/arch/csky/include/asm/page.h
> @@ -84,7 +84,7 @@ static inline unsigned long virt_to_pfn(const void *kaddr)
>
>  static inline void * pfn_to_virt(unsigned long pfn)
>  {
> -       return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
> +       return __va(pfn << PAGE_SHIFT);
>  }
Reviewed-by: Guo Ren <guoren@...nel.org>

>
>  #define MAP_NR(x)      PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
> --
> 2.17.1
>


-- 
Best Regards
 Guo Ren