linux-kernel - Re: [PATCH v12 3/5] arm64: pgtable: Add p*d_page

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Date:   Mon, 4 Jun 2018 13:13:51 +0100
From:   Will Deacon <will.deacon@....com>
To:     Chintan Pandya <cpandya@...eaurora.org>
Cc:     catalin.marinas@....com, mark.rutland@....com,
        akpm@...ux-foundation.org, toshi.kani@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 3/5] arm64: pgtable: Add p*d_page_vaddr helper macros

On Fri, Jun 01, 2018 at 06:09:16PM +0530, Chintan Pandya wrote:
> Add helper macros to give virtual references to page
> tables. These will be used while freeing dangling
> page tables.
> 
> Signed-off-by: Chintan Pandya <cpandya@...eaurora.org>
> ---
>  arch/arm64/include/asm/pgtable.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 7c4c8f3..ef4047f 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -580,6 +580,9 @@ static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
>  
>  #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
>  
> +#define pmd_page_vaddr(pmd) __va(pmd_page_paddr(pmd))
> +#define pud_page_vaddr(pud) __va(pud_page_paddr(pud))

Are these actually needed, or do pte_offset_kernel and pmd_offset do the
job already?

Will