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    Subject[RFC PATCH 1/5] hugetlb: add hugetlb helpers for soft dirty support
    Date
    Add interfaces to set and clear soft dirty in hugetlb ptes.  Make
    hugetlb interfaces needed for /proc clear_refs available outside
    hugetlb.c.

    arch/s390 has it's own version of most routines in asm-generic/hugetlb.h,
    so add new routines there as well.

    Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
    ---
    arch/s390/include/asm/hugetlb.h | 30 ++++++++++++++++++++++++++++++
    include/asm-generic/hugetlb.h | 30 ++++++++++++++++++++++++++++++
    include/linux/hugetlb.h | 1 +
    mm/hugetlb.c | 10 +---------
    4 files changed, 62 insertions(+), 9 deletions(-)

    diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
    index 60f9241e5e4a..b7d26248fb1c 100644
    --- a/arch/s390/include/asm/hugetlb.h
    +++ b/arch/s390/include/asm/hugetlb.h
    @@ -105,6 +105,11 @@ static inline pte_t huge_pte_mkdirty(pte_t pte)
    return pte_mkdirty(pte);
    }

    +static inline pte_t huge_pte_mkyoung(pte_t pte)
    +{
    + return pte_mkyoung(pte);
    +}
    +
    static inline pte_t huge_pte_wrprotect(pte_t pte)
    {
    return pte_wrprotect(pte);
    @@ -115,9 +120,34 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
    return pte_modify(pte, newprot);
    }

    +static inline bool huge_pte_soft_dirty(pte_t pte)
    +{
    + return pte_soft_dirty(pte);
    +}
    +
    +static inline pte_t huge_pte_clear_soft_dirty(pte_t pte)
    +{
    + return pte_clear_soft_dirty(pte);
    +}
    +
    +static inline pte_t huge_pte_swp_clear_soft_dirty(pte_t pte)
    +{
    + return pte_swp_clear_soft_dirty(pte);
    +}
    +
    static inline bool gigantic_page_runtime_supported(void)
    {
    return true;
    }

    +#if !defined(__HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE) && !defined(MODULE)
    +#include <asm/tlbflush.h>
    +
    +static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
    + unsigned long start, unsigned long end)
    +{
    + flush_tlb_range(vma, start, end);
    +}
    +#endif
    +
    #endif /* _ASM_S390_HUGETLB_H */
    diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
    index 8e1e6244a89d..d8a78dab63bf 100644
    --- a/include/asm-generic/hugetlb.h
    +++ b/include/asm-generic/hugetlb.h
    @@ -27,11 +27,31 @@ static inline pte_t huge_pte_mkdirty(pte_t pte)
    return pte_mkdirty(pte);
    }

    +static inline pte_t huge_pte_mkyoung(pte_t pte)
    +{
    + return pte_mkyoung(pte);
    +}
    +
    static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
    {
    return pte_modify(pte, newprot);
    }

    +static inline bool huge_pte_soft_dirty(pte_t pte)
    +{
    + return pte_soft_dirty(pte);
    +}
    +
    +static inline pte_t huge_pte_clear_soft_dirty(pte_t pte)
    +{
    + return pte_clear_soft_dirty(pte);
    +}
    +
    +static inline pte_t huge_pte_swp_clear_soft_dirty(pte_t pte)
    +{
    + return pte_swp_clear_soft_dirty(pte);
    +}
    +
    #ifndef __HAVE_ARCH_HUGE_PTE_CLEAR
    static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
    pte_t *ptep, unsigned long sz)
    @@ -133,4 +153,14 @@ static inline bool gigantic_page_runtime_supported(void)
    }
    #endif /* __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED */

    +#if !defined(__HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE) && !defined(MODULE)
    +#include <asm/tlbflush.h>
    +
    +static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
    + unsigned long start, unsigned long end)
    +{
    + flush_tlb_range(vma, start, end);
    +}
    +#endif
    +
    #endif /* _ASM_GENERIC_HUGETLB_H */
    diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
    index b5807f23caf8..7b6c35c5df99 100644
    --- a/include/linux/hugetlb.h
    +++ b/include/linux/hugetlb.h
    @@ -187,6 +187,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
    unsigned long address, unsigned long end, pgprot_t newprot);

    bool is_hugetlb_entry_migration(pte_t pte);
    +bool is_hugetlb_entry_hwpoisoned(pte_t pte);

    #else /* !CONFIG_HUGETLB_PAGE */

    diff --git a/mm/hugetlb.c b/mm/hugetlb.c
    index 4bdb58ab14cb..47f3123afd1a 100644
    --- a/mm/hugetlb.c
    +++ b/mm/hugetlb.c
    @@ -3759,7 +3759,7 @@ bool is_hugetlb_entry_migration(pte_t pte)
    return false;
    }

    -static bool is_hugetlb_entry_hwpoisoned(pte_t pte)
    +bool is_hugetlb_entry_hwpoisoned(pte_t pte)
    {
    swp_entry_t swp;

    @@ -4965,14 +4965,6 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
    return i ? i : err;
    }

    -#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
    -/*
    - * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
    - * implement this.
    - */
    -#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
    -#endif
    -
    unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
    unsigned long address, unsigned long end, pgprot_t newprot)
    {
    --
    2.29.2
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