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    SubjectRe: [PATCH v7 15/27] mm: Handle shadow stack page fault
    On Thu, Jun 06, 2019 at 01:06:34PM -0700, Yu-cheng Yu wrote:

    > diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
    > index 75d9d68a6de7..ffcc0be7cadc 100644
    > --- a/include/asm-generic/pgtable.h
    > +++ b/include/asm-generic/pgtable.h
    > @@ -1188,4 +1188,12 @@ static inline bool arch_has_pfn_modify_check(void)
    > #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED)
    > #endif
    >
    > +#ifndef CONFIG_ARCH_HAS_SHSTK
    > +#define pte_set_vma_features(pte, vma) pte
    > +#define arch_copy_pte_mapping(vma_flags) false

    static inline pte_t pte_set_vma_features(pte_t pte, struct vm_area_struct *vma)
    {
    return pte;
    }

    static inline bool arch_copy_pte_mapping(unsigned long vm_flags)
    {
    return false;
    }

    Please, this way we retain function prototype checking.

    > +#else
    > +pte_t pte_set_vma_features(pte_t pte, struct vm_area_struct *vma);
    > +bool arch_copy_pte_mapping(vm_flags_t vm_flags);
    > +#endif

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