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    pagewalk: improve vma handling · fafaa426
    Naoya Horiguchi 提交于
    Current implementation of page table walker has a fundamental problem in
    vma handling, which started when we tried to handle vma(VM_HUGETLB).
    Because it's done in pgd loop, considering vma boundary makes code
    complicated and bug-prone.
    
    From the users viewpoint, some user checks some vma-related condition to
    determine whether the user really does page walk over the vma.
    
    In order to solve these, this patch moves vma check outside pgd loop and
    introduce a new callback ->test_walk().
    Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Cyrill Gorcunov <gorcunov@openvz.org>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Pavel Emelyanov <xemul@parallels.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    fafaa426
pagewalk.c 6.8 KB