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From:   Anup Patel <anup@brainfault.org>
Date:   Thu, 22 Oct 2020 11:08:39 +0530
Message-ID: <CAAhSdy162QfyxGTn=UnEDnZ3OgKh-GN=bwgQ3jpWrp1ZMWKw8g@mail.gmail.com>
Subject: Re: [PATCH v4 4/5] riscv: Add support pte_protnone and pmd_protnone
 if CONFIG_NUMA_BALANCING
To:     Atish Patra <atish.patra@wdc.com>
Cc:     "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>,
        Greentime Hu <greentime.hu@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        David Hildenbrand <david@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jia He <justin.he@arm.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        linux-arch@vger.kernel.org,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Mike Rapoport <rppt@kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Steven Price <steven.price@arm.com>,
        Will Deacon <will@kernel.org>, Zong Li <zong.li@sifive.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
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On Tue, Oct 6, 2020 at 5:48 AM Atish Patra <atish.patra@wdc.com> wrote:
>
> From: Greentime Hu <greentime.hu@sifive.com>
>
> These two functions are used to distinguish between PROT_NONENUMA
> protections and hinting fault protections.
>
> Signed-off-by: Greentime Hu <greentime.hu@sifive.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)
>  {
> --
> 2.25.1
>

Looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup