linux-kernel - [PATCH v3 20/34] sparc: mm: Add p?d

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Date:   Wed, 27 Feb 2019 17:05:54 +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>,
        "David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: [PATCH v3 20/34] sparc: 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 sparc, we don't support large pages, so add stubs returning 0.

CC: "David S. Miller" <davem@...emloft.net>
CC: sparclinux@...r.kernel.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/sparc/include/asm/pgtable_32.h | 10 ++++++++++
 arch/sparc/include/asm/pgtable_64.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index 4eebed6c6781..dbc533e4c460 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -177,6 +177,11 @@ static inline int pmd_none(pmd_t pmd)
 	return !pmd_val(pmd);
 }
 
+static inline int pmd_large(pmd_t pmd)
+{
+	return 0;
+}
+
 static inline void pmd_clear(pmd_t *pmdp)
 {
 	int i;
@@ -199,6 +204,11 @@ static inline int pgd_present(pgd_t pgd)
 	return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
 }
 
+static inline int pgd_large(pgd_t pgd)
+{
+	return 0;
+}
+
 static inline void pgd_clear(pgd_t *pgdp)
 {
 	set_pte((pte_t *)pgdp, __pte(0));
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 1393a8ac596b..c32b26bdea53 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -892,6 +892,7 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 #define pgd_page_vaddr(pgd)		\
 	((unsigned long) __va(pgd_val(pgd)))
 #define pgd_present(pgd)		(pgd_val(pgd) != 0U)
+#define pgd_large(pgd)			(0)
 #define pgd_clear(pgdp)			(pgd_val(*(pgdp)) = 0UL)
 
 static inline unsigned long pud_large(pud_t pud)
-- 
2.20.1