linux-kernel - [PATCH v3 25/34] um: Implement the new page table range API

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Message-Id: <20230228213738.272178-26-willy@infradead.org>
Date:   Tue, 28 Feb 2023 21:37:28 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org, linux-arch@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org
Subject: [PATCH v3 25/34] um: Implement the new page table range API

Add set_ptes() and update_mmu_cache_range().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Richard Weinberger <richard@....at>
Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Cc: Johannes Berg <johannes@...solutions.net>
Cc: linux-um@...ts.infradead.org
---
 arch/um/include/asm/pgtable.h | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index a70d1618eb35..ca78c90ae74f 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -242,12 +242,20 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
 	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
 }
 
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
-			      pte_t *pteptr, pte_t pteval)
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+		pte_t *ptep, pte_t pte, unsigned int nr)
 {
-	set_pte(pteptr, pteval);
+	for (;;) {
+		set_pte(ptep, pte);
+		if (--nr == 0)
+			break;
+		ptep++;
+		pte_val(pte) += PAGE_SIZE;
+	}
 }
 
+#define set_pte_at(mm, addr, ptep, pte)	set_ptes(mm, addr, ptep, pte, 1)
+
 #define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t pte_a, pte_t pte_b)
 {
@@ -290,6 +298,7 @@ struct mm_struct;
 extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
 
 #define update_mmu_cache(vma,address,ptep) do {} while (0)
+#define update_mmu_cache_range(vma, address, ptep, nr) do {} while (0)
 
 /*
  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
-- 
2.39.1