[patch 25/67] arc: mm: add p?d_leaf() definitions

From: Steven Price <steven.price@arm.com>
Subject: arc: 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 will be provided by the
p?d_leaf() functions/macros.

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

Link: http://lkml.kernel.org/r/20191218162402.45610-3-steven.price@arm.com
Signed-off-by: Steven Price <steven.price@arm.com>
Acked-by: Vineet Gupta <redacted>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Heiko Carstens <redacted>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Jerome Glisse <redacted>
Cc: "Liang, Kan" <redacted>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Burton <redacted>
Cc: Paul Mackerras <redacted>
Cc: Paul Walmsley <redacted>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <redacted>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <redacted>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zong Li <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arc/include/asm/pgtable.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arc/include/asm/pgtable.h~arc-mm-add-pd_leaf-definitions
+++ a/arch/arc/include/asm/pgtable.h

@@ -273,6 +273,7 @@ static inline void pmd_set(pmd_t *pmdp,
 #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))

_