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From:   Peter Xu <peterx@redhat.com>
To:     linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc:     Mike Rapoport <rppt@linux.vnet.ibm.com>, peterx@redhat.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Jerome Glisse <jglisse@redhat.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Nadav Amit <nadav.amit@gmail.com>,
        Hugh Dickins <hughd@google.com>,
        Matthew Wilcox <willy@infradead.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Axel Rasmussen <axelrasmussen@google.com>
Subject: [PATCH v3 17/27] mm/hugetlb: Introduce huge pte version of uffd-wp helpers
Date:   Thu, 27 May 2021 16:23:07 -0400
Message-Id: <20210527202307.31882-1-peterx@redhat.com>
In-Reply-To: <20210527201927.29586-1-peterx@redhat.com>
References: <20210527201927.29586-1-peterx@redhat.com>
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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>
---
 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