linux-kernel - [PATCH v5 16/26] mm/hugetlb: Introduce huge pte version of uffd-wp helpers

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Message-Id: <20210715201618.211711-1-peterx@redhat.com>
Date:   Thu, 15 Jul 2021 16:16:18 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Alistair Popple <apopple@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>, peterx@...hat.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Tiberiu Georgescu <tiberiu.georgescu@...anix.com>,
        Hugh Dickins <hughd@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>
Subject: [PATCH v5 16/26] mm/hugetlb: Introduce huge pte version of uffd-wp helpers

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@...hat.com>
---
 include/asm-generic/hugetlb.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index 8e1e6244a89d..c45b9deb41ff 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -32,6 +32,21 @@ 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)
-- 
2.31.1