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    Subject[PATCH 1/3] mm: introduce mm_[p4d|pud|pmd]_folded
    Date
    Add three architecture overrideable function to test if the
    p4d, pud, or pmd layer of a page table is folded or not.

    Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
    ---
    include/linux/mm.h | 40 ++++++++++++++++++++++++++++++++++++++++
    1 file changed, 40 insertions(+)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index 0416a7204be3..d1029972541c 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -105,6 +105,46 @@ extern int mmap_rnd_compat_bits __read_mostly;
    #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page)))
    #endif

    +/*
    + * On some architectures it depends on the mm if the p4d/pud or pmd
    + * layer of the page table hierarchy is folded or not.
    + */
    +#ifndef mm_p4d_folded
    +#define mm_p4d_folded(mm) mm_p4d_folded(mm)
    +static inline bool mm_p4d_folded(struct mm_struct *mm)
    +{
    +#ifdef __PAGETABLE_P4D_FOLDED
    + return 1;
    +#else
    + return 0;
    +#endif
    +}
    +#endif
    +
    +#ifndef mm_pud_folded
    +#define mm_pud_folded(mm) mm_pud_folded(mm)
    +static inline bool mm_pud_folded(struct mm_struct *mm)
    +{
    +#ifdef __PAGETABLE_PUD_FOLDED
    + return 1;
    +#else
    + return 0;
    +#endif
    +}
    +#endif
    +
    +#ifndef mm_pmd_folded
    +#define mm_pmd_folded(mm) mm_pmd_folded(mm)
    +static inline bool mm_pmd_folded(struct mm_struct *mm)
    +{
    +#ifdef __PAGETABLE_PMD_FOLDED
    + return 1;
    +#else
    + return 0;
    +#endif
    +}
    +#endif
    +
    /*
    * Default maximum number of active map areas, this limits the number of vmas
    * per mm struct. Users can overwrite this number by sysctl but there is a
    --
    2.16.4
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