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Message-Id: <20190306155031.4291-6-steven.price@arm.com>
Date: Wed, 6 Mar 2019 15:50:17 +0000
From: Steven Price <steven.price@....com>
To: linux-mm@...ck.org
Cc: Steven Price <steven.price@....com>,
Andy Lutomirski <luto@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
Catalin Marinas <catalin.marinas@....com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ingo Molnar <mingo@...hat.com>,
James Morse <james.morse@....com>,
Jérôme Glisse <jglisse@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Will Deacon <will.deacon@....com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Mark Rutland <Mark.Rutland@....com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
Palmer Dabbelt <palmer@...ive.com>,
Albert Ou <aou@...s.berkeley.edu>,
linux-riscv@...ts.infradead.org
Subject: [PATCH v4 05/19] riscv: mm: Add p?d_large() 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_large() functions/macros.
For riscv a page is large when it has a read, write or execute bit
set on it.
CC: Palmer Dabbelt <palmer@...ive.com>
CC: Albert Ou <aou@...s.berkeley.edu>
CC: linux-riscv@...ts.infradead.org
Signed-off-by: Steven Price <steven.price@....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 7aa0ea9bd8bb..73747d9d7c66 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -51,6 +51,13 @@ static inline int pud_bad(pud_t pud)
return !pud_present(pud);
}
+#define pud_large pud_large
+static inline int pud_large(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 16301966d65b..c66e2a69215f 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -111,6 +111,13 @@ static inline int pmd_bad(pmd_t pmd)
return !pmd_present(pmd);
}
+#define pmd_large pmd_large
+static inline int pmd_large(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;
--
2.20.1
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