riscv: mm: add p?d_leaf() definitions
authorSteven Price <steven.price@arm.com>
Tue, 4 Feb 2020 01:35:28 +0000 (17:35 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 4 Feb 2020 03:05:24 +0000 (03:05 +0000)
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.

Link: http://lkml.kernel.org/r/20191218162402.45610-8-steven.price@arm.com
Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Zong Li <zong.li@sifive.com>
Acked-by: Paul Walmsley <paul.walmsley@sifive.com> [arch/riscv]
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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 <borntraeger@de.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
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 <jglisse@redhat.com>
Cc: "Liang, Kan" <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

index 36e638d1dfe4d9c0216878ff06a8e13a616f66aa..b15f70a1fdfa3a77a3d711820893d6148f7311c8 100644 (file)
@@ -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;
index f66b87314fa23c5c5ba99b9d3ad3c0bf95b680d4..e43041519edd7a5dc42b78f9fed2f5c5d375fb5b 100644 (file)
@@ -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;