Re: [PATCH v11 07/22] riscv: mm: Add p?d_leaf() definitions

walk_page_range() is going to be allowed to walk page tables other than
those of user space. For this it needs to know when it has reached a
'leaf' entry in the page tables. This information is provided by the
p?d_leaf() functions/macros.

For riscv a page is a leaf page when it has a read, write or execute bit
set on it.

CC: Palmer Dabbelt <redacted>
CC: Albert Ou <aou@eecs.berkeley.edu>
CC: linux-riscv@lists.infradead.org
Signed-off-by: Steven Price <steven.price@arm.com>
---
  arch/riscv/include/asm/pgtable-64.h | 7 +++++++
  arch/riscv/include/asm/pgtable.h    | 7 +++++++
  2 files changed, 14 insertions(+)

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 74630989006d..e88a8e8acbdf 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h

@@ -43,6 +43,13 @@ static inline int pud_bad(pud_t pud)
  	return !pud_present(pud);
  }
  
+#define pud_leaf	pud_leaf
+static inline int pud_leaf(pud_t pud)
+{
+	return pud_present(pud)
+		&& (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
+}
+
  static inline void set_pud(pud_t *pudp, pud_t pud)
  {
  	*pudp = pud;

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 7255f2d8395b..b9a679153265 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h

@@ -130,6 +130,13 @@ static inline int pmd_bad(pmd_t pmd)
  	return !pmd_present(pmd);
  }
  
+#define pmd_leaf	pmd_leaf
+static inline int pmd_leaf(pmd_t pmd)
+{
+	return pmd_present(pmd)
+		&& (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
+}
+
  static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
  {
  	*pmdp = pmd;