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    Subject[PATCHv2 15/28] thp: handle file COW faults
    Date
    File COW for THP is handled on pte level: just split the pmd.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    mm/memory.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/mm/memory.c b/mm/memory.c
    index 6c98ed8e3c4a..19eff2164e5b 100644
    --- a/mm/memory.c
    +++ b/mm/memory.c
    @@ -3334,6 +3334,11 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
    if (fe->vma->vm_ops->pmd_fault)
    return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd,
    fe->flags);
    +
    + /* COW handled on pte level: split pmd */
    + VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma);
    + split_huge_pmd(fe->vma, fe->pmd, fe->address);
    +
    return VM_FAULT_FALLBACK;
    }

    --
    2.7.0
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