Re: [PATCH 1/4] asm-generic/page.h: apply page shift to PFN instead of VA in pfn_to_virt

[Guo Ren]

On Wed, Jan 31, 2024 at 2:27 PM Yan Zhao <yan.y.zhao@xxxxxxxxx> 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: 2d78057f0dd4 ("asm-generic/page.h: Make pfn accessors static inlines")
> Signed-off-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
> ---
>  include/asm-generic/page.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h
> index 9773582fd96e..4f1265207b9a 100644
> --- a/include/asm-generic/page.h
> +++ b/include/asm-generic/page.h
> @@ -81,7 +81,7 @@ static inline unsigned long virt_to_pfn(const void *kaddr)
>  #define virt_to_pfn virt_to_pfn
>  static inline void *pfn_to_virt(unsigned long pfn)
>  {
> -       return __va(pfn) << PAGE_SHIFT;
> +       return __va(pfn << PAGE_SHIFT);
Oh, that's a terrible bug; Thx for fixing it.

Reviewed-by: Guo Ren <guoren@xxxxxxxxxx>

>  }
>  #define pfn_to_virt pfn_to_virt
>
> --
> 2.17.1
>


-- 
Best Regards
 Guo Ren