[PATCH v6 11/23] mm/hugetlb: Introduce huge pte version of uffd-wp helpers
From: Peter Xu <peterx@redhat.com>
Date: 2021-11-15 08:03:22
Also in:
lkml
Subsystem:
generic include/asm header files, s390 architecture, the rest · Maintainers:
Arnd Bergmann, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds
They will be used in the follow up patches to either check/set/clear uffd-wp bit of a huge pte. So far it reuses all the small pte helpers. Archs can overwrite these versions when necessary (with __HAVE_ARCH_HUGE_PTE_UFFD_WP* macros) in the future. Signed-off-by: Peter Xu <peterx@redhat.com> --- arch/s390/include/asm/hugetlb.h | 15 +++++++++++++++ include/asm-generic/hugetlb.h | 15 +++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index 60f9241e5e4a..19c4b4431d27 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h@@ -115,6 +115,21 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) return pte_modify(pte, newprot); } +static inline pte_t huge_pte_mkuffd_wp(pte_t pte) +{ + return pte; +} + +static inline pte_t huge_pte_clear_uffd_wp(pte_t pte) +{ + return pte; +} + +static inline int huge_pte_uffd_wp(pte_t pte) +{ + return 0; +} + static inline bool gigantic_page_runtime_supported(void) { return true;
diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index f39cad20ffc6..896f341f614d 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h@@ -35,6 +35,21 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) return pte_modify(pte, newprot); } +static inline pte_t huge_pte_mkuffd_wp(pte_t pte) +{ + return pte_mkuffd_wp(pte); +} + +static inline pte_t huge_pte_clear_uffd_wp(pte_t pte) +{ + return pte_clear_uffd_wp(pte); +} + +static inline int huge_pte_uffd_wp(pte_t pte) +{ + return pte_uffd_wp(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)
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2.32.0