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    Subject[RFC PATCH 09/26] hugetlb: add hugetlb_hgm_enabled
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    Currently, this is always true if the VMA is shared. In the future, it's
    possible that private mappings will get some or all HGM functionality.

    Signed-off-by: James Houghton <jthoughton@google.com>
    ---
    include/linux/hugetlb.h | 10 ++++++++++
    mm/hugetlb.c | 8 ++++++++
    2 files changed, 18 insertions(+)

    diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
    index 33ba48fac551..e7a6b944d0cc 100644
    --- a/include/linux/hugetlb.h
    +++ b/include/linux/hugetlb.h
    @@ -1174,6 +1174,16 @@ static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
    }
    #endif /* CONFIG_HUGETLB_PAGE */

    +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
    +/* If HugeTLB high-granularity mappings are enabled for this VMA. */
    +bool hugetlb_hgm_enabled(struct vm_area_struct *vma);
    +#else
    +static inline bool hugetlb_hgm_enabled(struct vm_area_struct *vma)
    +{
    + return false;
    +}
    +#endif
    +
    static inline spinlock_t *huge_pte_lock(struct hstate *h,
    struct mm_struct *mm, pte_t *pte)
    {
    diff --git a/mm/hugetlb.c b/mm/hugetlb.c
    index a2d2ffa76173..8b10b941458d 100644
    --- a/mm/hugetlb.c
    +++ b/mm/hugetlb.c
    @@ -6983,6 +6983,14 @@ pte_t *huge_pte_offset(struct mm_struct *mm,

    #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */

    +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
    +bool hugetlb_hgm_enabled(struct vm_area_struct *vma)
    +{
    + /* All shared VMAs have HGM enabled. */
    + return vma->vm_flags & VM_SHARED;
    +}
    +#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */
    +
    /*
    * These functions are overwritable if your architecture needs its own
    * behavior.
    --
    2.37.0.rc0.161.g10f37bed90-goog
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