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* [PATCH v12 02/22] arc: mm: Add p?d_leaf() definitions
       [not found] <>
@ 2019-10-18 10:12 ` Steven Price
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From: Steven Price @ 2019-10-18 10:12 UTC (permalink / raw)
  To: linux-mm
  Cc: Mark Rutland, Peter Zijlstra, Catalin Marinas, Dave Hansen,
	H. Peter Anvin, Will Deacon, Liang, Kan, x86, Steven Price,
	Ingo Molnar, linux-snps-arc, Arnd Bergmann,
	Jérôme Glisse, Borislav Petkov, Andy Lutomirski,
	Thomas Gleixner, linux-arm-kernel, Ard Biesheuvel, Vineet Gupta,
	linux-kernel, James Morse, Andrew Morton

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 will be provided by the
p?d_leaf() functions/macros.

For arc, we only have two levels, so only pmd_leaf() is needed.

CC: Vineet Gupta <>
Acked-by: Vineet Gupta <>
Signed-off-by: Steven Price <>
 arch/arc/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 7addd0301c51..5ec798e50836 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -274,6 +274,7 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 #define pmd_none(x)			(!pmd_val(x))
 #define	pmd_bad(x)			((pmd_val(x) & ~PAGE_MASK))
 #define pmd_present(x)			(pmd_val(x))
+#define pmd_leaf(x)			(pmd_val(pmd) & _PAGE_HW_SZ)
 #define pmd_clear(xp)			do { pmd_val(*(xp)) = 0; } while (0)
 #define pte_page(pte)		pfn_to_page(pte_pfn(pte))

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