linux-kernel - [PATCH v3 09/34] m68k: mm: Add p?d

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Message-Id: <20190227170608.27963-10-steven.price@arm.com>
Date:   Wed, 27 Feb 2019 17:05:43 +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>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org
Subject: [PATCH v3 09/34] m68k: 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 m68k, we don't support large pages, so add stubs returning 0

CC: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: linux-m68k@...ts.linux-m68k.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/m68k/include/asm/mcf_pgtable.h      | 2 ++
 arch/m68k/include/asm/motorola_pgtable.h | 2 ++
 arch/m68k/include/asm/pgtable_no.h       | 1 +
 arch/m68k/include/asm/sun3_pgtable.h     | 2 ++
 4 files changed, 7 insertions(+)

diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index 5d5502cb2b2d..63827d28a017 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -196,11 +196,13 @@ static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
 #define pmd_bad(pmd) pmd_bad2(&(pmd))
 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
+#define pmd_large(pmd) (0)
 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
 
 static inline int pgd_none(pgd_t pgd) { return 0; }
 static inline int pgd_bad(pgd_t pgd) { return 0; }
 static inline int pgd_present(pgd_t pgd) { return 1; }
+static inline int pgd_large(pgd_t pgd) { return 0; }
 static inline void pgd_clear(pgd_t *pgdp) {}
 
 #define pte_ERROR(e) \
diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
index 7f66a7bad7a5..a649eb8a91de 100644
--- a/arch/m68k/include/asm/motorola_pgtable.h
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -138,6 +138,7 @@ static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 #define pmd_none(pmd)		(!pmd_val(pmd))
 #define pmd_bad(pmd)		((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 #define pmd_present(pmd)	(pmd_val(pmd) & _PAGE_TABLE)
+#define pmd_large(pmd)		(0)
 #define pmd_clear(pmdp) ({			\
 	unsigned long *__ptr = pmdp->pmd;	\
 	short __i = 16;				\
@@ -150,6 +151,7 @@ static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 #define pgd_none(pgd)		(!pgd_val(pgd))
 #define pgd_bad(pgd)		((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 #define pgd_present(pgd)	(pgd_val(pgd) & _PAGE_TABLE)
+#define pgd_large(pgd)		(0)
 #define pgd_clear(pgdp)		({ pgd_val(*pgdp) = 0; })
 #define pgd_page(pgd)		(mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
 
diff --git a/arch/m68k/include/asm/pgtable_no.h b/arch/m68k/include/asm/pgtable_no.h
index fc3a96c77bd8..eeef17b2eae8 100644
--- a/arch/m68k/include/asm/pgtable_no.h
+++ b/arch/m68k/include/asm/pgtable_no.h
@@ -17,6 +17,7 @@
  * Trivial page table functions.
  */
 #define pgd_present(pgd)	(1)
+#define pgd_large(pgd)		(0)
 #define pgd_none(pgd)		(0)
 #define pgd_bad(pgd)		(0)
 #define pgd_clear(pgdp)
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
index c987d50866b4..eea72e3515db 100644
--- a/arch/m68k/include/asm/sun3_pgtable.h
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -143,6 +143,7 @@ static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
+#define pmd_large(pmd) (0)
 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 
 static inline int pgd_none (pgd_t pgd) { return 0; }
@@ -150,6 +151,7 @@ static inline int pgd_bad (pgd_t pgd) { return 0; }
 static inline int pgd_present (pgd_t pgd) { return 1; }
 static inline void pgd_clear (pgd_t *pgdp) {}
 
+static inline int pgd_large(pgd_t pgd) { return 0; }
 
 #define pte_ERROR(e) \
 	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
-- 
2.20.1