[PATCH v3 5/9] mm: Use common huge_pte_clear() function for riscv/arm64

[Alexandre Ghiti]

Both architectures have the same implementation so move it to generic code.

Signed-off-by: Alexandre Ghiti <alexghiti at rivosinc.com>
---
 arch/arm64/include/asm/hugetlb.h |  3 ---
 arch/arm64/mm/hugetlbpage.c      | 12 ------------
 arch/riscv/include/asm/hugetlb.h |  4 ----
 arch/riscv/include/asm/pgtable.h |  5 +++--
 arch/riscv/mm/hugetlbpage.c      | 19 -------------------
 include/linux/hugetlb_contpte.h  |  4 ++++
 mm/hugetlb_contpte.c             | 14 ++++++++++++++
 7 files changed, 21 insertions(+), 40 deletions(-)

diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index d35093b7ab59..fab0afbe4eea 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -40,9 +40,6 @@ extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
 #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);
-#define __HAVE_ARCH_HUGE_PTE_CLEAR
-extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
-			   pte_t *ptep, unsigned long sz);
 
 void __init arm64_hugetlb_cma_reserve(void);
 
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index c7130d1f07c4..495f706e0170 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -266,18 +266,6 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
 	return entry;
 }
 
-void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
-		    pte_t *ptep, unsigned long sz)
-{
-	int i, ncontig;
-	size_t pgsize;
-
-	ncontig = arch_contpte_get_num_contig(ptep, sz, &pgsize);
-
-	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
-		__pte_clear(mm, addr, ptep);
-}
-
 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 			      unsigned long addr, pte_t *ptep)
 {
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index 28cbf5d761e1..ca9930cdf2e6 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -20,10 +20,6 @@ bool arch_hugetlb_migration_supported(struct hstate *h);
 #endif
 
 #ifdef CONFIG_RISCV_ISA_SVNAPOT
-#define __HAVE_ARCH_HUGE_PTE_CLEAR
-void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
-		    pte_t *ptep, unsigned long sz);
-
 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 			      unsigned long addr, pte_t *ptep);
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 46b409e558b3..5ab0559b0bd2 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -615,8 +615,8 @@ static inline int arch_contpte_get_num_contig(pte_t *ptep, unsigned long size,
 }
 #endif
 
-static inline void pte_clear(struct mm_struct *mm,
-	unsigned long addr, pte_t *ptep)
+static inline void __pte_clear(struct mm_struct *mm,
+			       unsigned long addr, pte_t *ptep)
 {
 	__set_pte_at(mm, ptep, __pte(0));
 }
@@ -731,6 +731,7 @@ static inline pte_t ptep_get(pte_t *ptep)
 
 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 #define ptep_get_and_clear	__ptep_get_and_clear
+#define pte_clear		__pte_clear
 
 #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 0ecb2846c3f0..e2093e7266a5 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -251,25 +251,6 @@ pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 	return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
 }
 
-void huge_pte_clear(struct mm_struct *mm,
-		    unsigned long addr,
-		    pte_t *ptep,
-		    unsigned long sz)
-{
-	size_t pgsize;
-	pte_t pte = ptep_get(ptep);
-	int i, pte_num;
-
-	if (!pte_napot(pte)) {
-		pte_clear(mm, addr, ptep);
-		return;
-	}
-
-	pte_num = arch_contpte_get_num_contig(ptep, sz, &pgsize);
-	for (i = 0; i < pte_num; i++, addr += pgsize, ptep++)
-		pte_clear(mm, addr, ptep);
-}
-
 static bool is_napot_size(unsigned long size)
 {
 	unsigned long order;
diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h
index 7acd734a75e8..d9892a047b2b 100644
--- a/include/linux/hugetlb_contpte.h
+++ b/include/linux/hugetlb_contpte.h
@@ -14,4 +14,8 @@ extern void set_huge_pte_at(struct mm_struct *mm,
 			    unsigned long addr, pte_t *ptep, pte_t pte,
 			    unsigned long sz);
 
+#define __HAVE_ARCH_HUGE_PTE_CLEAR
+extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+			   pte_t *ptep, unsigned long sz);
+
 #endif /* _LINUX_HUGETLB_CONTPTE_H */
diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c
index 9a3a376784b0..b9634ffa1bad 100644
--- a/mm/hugetlb_contpte.c
+++ b/mm/hugetlb_contpte.c
@@ -12,6 +12,7 @@
  *   - __ptep_get()
  *   - __set_ptes()
  *   - __ptep_get_and_clear()
+ *   - __pte_clear()
  *   - pte_cont()
  *   - arch_contpte_get_num_contig()
  */
@@ -20,6 +21,7 @@
  * This file implements the following contpte aware API:
  *   - huge_ptep_get()
  *   - set_huge_pte_at()
+ *   - huge_pte_clear()
  */
 
 pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -101,3 +103,15 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 
 	set_contptes(mm, addr, ptep, pte, ncontig, pgsize);
 }
+
+void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+		    pte_t *ptep, unsigned long sz)
+{
+	int i, ncontig;
+	size_t pgsize;
+
+	ncontig = arch_contpte_get_num_contig(ptep, sz, &pgsize);
+
+	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
+		__pte_clear(mm, addr, ptep);
+}
-- 
2.39.2