[v3,8/9] mm: Use common huge_ptep_set_wrprotect() function for riscv/arm64

Commit Message

Alexandre Ghiti Aug. 2, 2024, 3:14 p.m. UTC

After some adjustments, both architectures have the same implementation
so move it to the generic code.

Signed-off-by: Alexandre Ghiti <[e-mail]>
---
 arch/arm64/include/asm/hugetlb.h |  3 ---
 arch/arm64/mm/hugetlbpage.c      | 27 ---------------------------
 arch/riscv/include/asm/hugetlb.h |  4 ----
 arch/riscv/include/asm/pgtable.h |  7 ++++---
 arch/riscv/mm/hugetlbpage.c      | 22 ----------------------
 include/linux/hugetlb_contpte.h  |  4 ++++
 mm/hugetlb_contpte.c             | 22 ++++++++++++++++++++++
 7 files changed, 30 insertions(+), 59 deletions(-)

Patch

diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 6b84e287b72d..4ceb6cb1bec5 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -27,9 +27,6 @@  static inline void arch_clear_hugetlb_flags(struct folio *folio)
 
 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
 #define arch_make_huge_pte arch_make_huge_pte
-#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
-extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
-				    unsigned long addr, pte_t *ptep);
 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
 extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 				   unsigned long addr, pte_t *ptep);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 658635022e4d..8d271e175848 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -266,33 +266,6 @@  pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
 	return entry;
 }
 
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
-			     unsigned long addr, pte_t *ptep)
-{
-	unsigned long pfn, dpfn;
-	pgprot_t hugeprot;
-	int ncontig, i;
-	size_t pgsize;
-	pte_t pte;
-
-	if (!pte_cont(__ptep_get(ptep))) {
-		__ptep_set_wrprotect(mm, addr, ptep);
-		return;
-	}
-
-	ncontig = find_num_contig(mm, addr, ptep, &pgsize);
-	dpfn = pgsize >> PAGE_SHIFT;
-
-	pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
-	pte = pte_wrprotect(pte);
-
-	hugeprot = pte_pgprot(pte);
-	pfn = pte_pfn(pte);
-
-	for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
-		__set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);
-}
-
 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 			    unsigned long addr, pte_t *ptep)
 {
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index bf533c2cef84..4c692dd82779 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -24,10 +24,6 @@  bool arch_hugetlb_migration_supported(struct hstate *h);
 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 			    unsigned long addr, pte_t *ptep);
 
-#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
-			     unsigned long addr, pte_t *ptep);
-
 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
 #define arch_make_huge_pte arch_make_huge_pte
 
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 5d9b051ac51c..f4bb0c971bd8 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -639,9 +639,8 @@  static inline pte_t __ptep_get_and_clear(struct mm_struct *mm,
 	return pte;
 }
 
-#define __HAVE_ARCH_PTEP_SET_WRPROTECT
-static inline void ptep_set_wrprotect(struct mm_struct *mm,
-				      unsigned long address, pte_t *ptep)
+static inline void __ptep_set_wrprotect(struct mm_struct *mm,
+					unsigned long address, pte_t *ptep)
 {
 	atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep);
 }
@@ -735,6 +734,8 @@  static inline pte_t ptep_get(pte_t *ptep)
 #define pte_clear		__pte_clear
 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 #define ptep_set_access_flags	__ptep_set_access_flags
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+#define ptep_set_wrprotect	__ptep_set_wrprotect
 
 #define pgprot_nx pgprot_nx
 static inline pgprot_t pgprot_nx(pgprot_t _prot)
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 0e2ca7327479..8963a4e77742 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -173,28 +173,6 @@  pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
 	return entry;
 }
 
-void huge_ptep_set_wrprotect(struct mm_struct *mm,
-			     unsigned long addr,
-			     pte_t *ptep)
-{
-	pte_t pte = ptep_get(ptep);
-	pte_t orig_pte;
-	int pte_num;
-
-	if (!pte_napot(pte)) {
-		ptep_set_wrprotect(mm, addr, ptep);
-		return;
-	}
-
-	pte_num = arch_contpte_get_num_contig(mm, addr, ptep, 0, NULL);
-
-	orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
-
-	orig_pte = pte_wrprotect(orig_pte);
-
-	set_ptes(mm, addr, ptep, orig_pte, pte_num);
-}
-
 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 			    unsigned long addr,
 			    pte_t *ptep)
diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h
index fea47035ac38..02bce0ed93d8 100644
--- a/include/linux/hugetlb_contpte.h
+++ b/include/linux/hugetlb_contpte.h
@@ -27,4 +27,8 @@  extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 				      unsigned long addr, pte_t *ptep,
 				      pte_t pte, int dirty);
 
+#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
+extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
+				    unsigned long addr, pte_t *ptep);
+
 #endif /* _LINUX_HUGETLB_CONTPTE_H */
diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c
index 21f5c89daa6b..b00bbcc2d939 100644
--- a/mm/hugetlb_contpte.c
+++ b/mm/hugetlb_contpte.c
@@ -14,6 +14,7 @@ 
  *   - __ptep_get_and_clear()
  *   - __pte_clear()
  *   - __ptep_set_access_flags()
+ *   - __ptep_set_wrprotect()
  *   - pte_cont()
  *   - arch_contpte_get_num_contig()
  */
@@ -25,6 +26,7 @@ 
  *   - huge_pte_clear()
  *   - huge_ptep_get_and_clear()
  *   - huge_ptep_set_access_flags()
+ *   - huge_ptep_set_wrprotect()
  */
 
 pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -232,3 +234,23 @@  int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 
 	return 1;
 }
+
+void huge_ptep_set_wrprotect(struct mm_struct *mm,
+			     unsigned long addr, pte_t *ptep)
+{
+	int ncontig;
+	size_t pgsize;
+	pte_t pte;
+
+	if (!pte_cont(__ptep_get(ptep))) {
+		__ptep_set_wrprotect(mm, addr, ptep);
+		return;
+	}
+
+	ncontig = arch_contpte_get_num_contig(mm, addr, ptep, 0, &pgsize);
+
+	pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
+	pte = pte_wrprotect(pte);
+
+	set_contptes(mm, addr, ptep, pte, ncontig, pgsize);
+}