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Subject[PATCH RESEND v2 5/9] mm: Use common huge_pte_clear() function for riscv/arm64
Date
Both architectures have the same implementation so move it to generic code.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---
arch/arm64/mm/hugetlbpage.c | 12 ------------
arch/riscv/include/asm/pgtable.h | 5 +++--
arch/riscv/mm/hugetlbpage.c | 19 -------------------
mm/contpte.c | 14 ++++++++++++++
4 files changed, 17 insertions(+), 33 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index b8353b0a273c..cf44837369be 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -277,18 +277,6 @@ 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/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 5d1d3a6c7c44..0847a7fb8661 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -644,8 +644,8 @@ static inline void __set_ptes(struct mm_struct *mm, unsigned long addr,
#define set_contptes(mm, addr, ptep, pte, nr, pgsize) \
__set_ptes(mm, addr, ptep, pte, nr)

-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));
}
@@ -700,6 +700,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
#define set_ptes __set_ptes
#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 d8f07aef758b..437b1df059eb 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -254,25 +254,6 @@ 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, 0, &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/mm/contpte.c b/mm/contpte.c
index 2320ee23478a..22e0de197bd3 100644
--- a/mm/contpte.c
+++ b/mm/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(pte_t *ptep)
@@ -102,3 +104,15 @@ 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

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