linux-kernel - Re: [PATCH v4 4/5] riscv: Add support pte_protnone and pmd_protnone if CONFIG_NUMA

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Date:   Thu, 05 Nov 2020 09:34:02 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Atish Patra <Atish.Patra@....com>
CC:     linux-kernel@...r.kernel.org, greentime.hu@...ive.com,
        aou@...s.berkeley.edu, akpm@...ux-foundation.org,
        anshuman.khandual@....com, anup@...infault.org,
        Arnd Bergmann <arnd@...db.de>,
        Atish Patra <Atish.Patra@....com>, catalin.marinas@....com,
        david@...hat.com, Greg KH <gregkh@...uxfoundation.org>,
        justin.he@....com, Jonathan.Cameron@...wei.com,
        wangkefeng.wang@...wei.com, linux-arch@...r.kernel.org,
        linux-riscv@...ts.infradead.org, rppt@...nel.org,
        nsaenzjulienne@...e.de, Paul Walmsley <paul.walmsley@...ive.com>,
        rafael@...nel.org, steven.price@....com, will@...nel.org,
        zong.li@...ive.com, linux-arm-kernel@...ts.infradead.org
Subject:     Re: [PATCH v4 4/5] riscv: Add support pte_protnone and pmd_protnone if CONFIG_NUMA_BALANCING

On Mon, 05 Oct 2020 17:17:51 PDT (-0700), Atish Patra wrote:
> From: Greentime Hu <greentime.hu@...ive.com>
>
> These two functions are used to distinguish between PROT_NONENUMA
> protections and hinting fault protections.
>
> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  arch/riscv/include/asm/pgtable.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 515b42f98d34..2751110675e6 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -183,6 +183,11 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
>  	return (unsigned long)pfn_to_virt(pmd_val(pmd) >> _PAGE_PFN_SHIFT);
>  }
>
> +static inline pte_t pmd_pte(pmd_t pmd)
> +{
> +	return __pte(pmd_val(pmd));
> +}
> +
>  /* Yields the page frame number (PFN) of a page table entry */
>  static inline unsigned long pte_pfn(pte_t pte)
>  {
> @@ -286,6 +291,21 @@ static inline pte_t pte_mkhuge(pte_t pte)
>  	return pte;
>  }
>
> +#ifdef CONFIG_NUMA_BALANCING
> +/*
> + * See the comment in include/asm-generic/pgtable.h
> + */
> +static inline int pte_protnone(pte_t pte)
> +{
> +	return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE)) == _PAGE_PROT_NONE;
> +}
> +
> +static inline int pmd_protnone(pmd_t pmd)
> +{
> +	return pte_protnone(pmd_pte(pmd));
> +}
> +#endif
> +
>  /* Modify page protection bits */
>  static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
>  {

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>