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* [PATCH v15 02/23] arc: mm: Add p?d_leaf() definitions
       [not found] <20191101140942.51554-1-steven.price@arm.com>
@ 2019-11-01 14:09 ` Steven Price
  0 siblings, 0 replies; only message in thread
From: Steven Price @ 2019-11-01 14:09 UTC (permalink / raw)
  To: Andrew Morton, linux-mm
  Cc: Mark Rutland, x86, Arnd Bergmann, Ard Biesheuvel, Peter Zijlstra,
	Catalin Marinas, Dave Hansen, linux-kernel, Steven Price,
	Vineet Gupta, Jérôme Glisse, Ingo Molnar,
	Borislav Petkov, Andy Lutomirski, H. Peter Anvin, James Morse,
	Thomas Gleixner, linux-snps-arc, Will Deacon, linux-arm-kernel,
	Liang, Kan

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 <vgupta@synopsys.com>
CC: linux-snps-arc@lists.infradead.org
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
 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..b4a0cf27ac1c 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(x) & _PAGE_HW_SZ)
 #define pmd_clear(xp)			do { pmd_val(*(xp)) = 0; } while (0)
 
 #define pte_page(pte)		pfn_to_page(pte_pfn(pte))
-- 
2.20.1


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     [not found] <20191101140942.51554-1-steven.price@arm.com>
2019-11-01 14:09 ` [PATCH v15 02/23] arc: mm: Add p?d_leaf() definitions Steven Price

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