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    Subject[RFC/RFT PATCH 5/6] riscv: Add support pte_protnone and pmd_protnone if CONFIG_NUMA_BALANCING
    Date
    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)
    {
    --
    2.24.0
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