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    Subject[PATCH v11 10/10] arm64, mm, numa: Add NUMA balancing support for arm64.
    Date
    From: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>

    Enable NUMA balancing for arm64 platforms.
    Add pte, pmd protnone helpers for use by automatic NUMA balancing.

    Reviewed-by: Robert Richter <rrichter@cavium.com>
    Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
    Signed-off-by: David Daney <david.daney@cavium.com>
    ---
    arch/arm64/Kconfig | 1 +
    arch/arm64/include/asm/pgtable.h | 15 +++++++++++++++
    2 files changed, 16 insertions(+)

    diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
    index 9f0972a..6e22503 100644
    --- a/arch/arm64/Kconfig
    +++ b/arch/arm64/Kconfig
    @@ -11,6 +11,7 @@ config ARM64
    select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
    select ARCH_USE_CMPXCHG_LOCKREF
    select ARCH_SUPPORTS_ATOMIC_RMW
    + select ARCH_SUPPORTS_NUMA_BALANCING
    select ARCH_WANT_OPTIONAL_GPIOLIB
    select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
    select ARCH_WANT_FRAME_POINTERS
    diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
    index bf464de..5af9db2 100644
    --- a/arch/arm64/include/asm/pgtable.h
    +++ b/arch/arm64/include/asm/pgtable.h
    @@ -346,6 +346,21 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
    return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT);
    }

    +#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) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE;
    +}
    +
    +static inline int pmd_protnone(pmd_t pmd)
    +{
    + return pte_protnone(pmd_pte(pmd));
    +}
    +#endif
    +
    /*
    * THP definitions.
    */
    --
    1.8.3.1
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