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Subject[PATCH v9 02/15] ARM: pgtable: switch to use pgtable-nopud.h
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From: Russell King <rmk+kernel@arm.linux.org.uk>

Nick Piggin noted upon introducing 4level-fixup.h:

| Add a temporary "fallback" header so architectures can run with
| the 4level pagetables patch without modification. All architectures
| should be converted to use the folding headers (include/asm-generic/
| pgtable-nop?d.h) as soon as possible, and the fallback header removed.

This makes ARM compliant with this statement.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/include/asm/pgalloc.h | 2 +-
arch/arm/include/asm/pgtable.h | 23 +++++++++++++----------
arch/arm/include/asm/tlb.h | 1 +
3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index 3e08fd3..7418894 100644
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -30,7 +30,7 @@
*/
#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
#define pmd_free(mm, pmd) do { } while (0)
-#define pgd_populate(mm,pmd,pte) BUG()
+#define pud_populate(mm,pmd,pte) BUG()

extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 9451dce..a1aca79 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -11,15 +11,16 @@
#define _ASMARM_PGTABLE_H

#include <linux/const.h>
-#include <asm-generic/4level-fixup.h>
#include <asm/proc-fns.h>

#ifndef CONFIG_MMU

+#include <asm-generic/4level-fixup.h>
#include "pgtable-nommu.h"

#else

+#include <asm-generic/pgtable-nopud.h>
#include <asm/memory.h>
#include <mach/vmalloc.h>
#include <asm/pgtable-hwdef.h>
@@ -164,20 +165,22 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)

/*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
- * setup: the pgd is never bad, and a pmd always exists (as it's folded
- * into the pgd entry)
+ * The "pud_xxx()" functions here are trivial when the pmd is folded into
+ * the pud: the pud entry is never bad, always exists, and can't be set or
+ * cleared.
*/
-#define pgd_none(pgd) (0)
-#define pgd_bad(pgd) (0)
-#define pgd_present(pgd) (1)
-#define pgd_clear(pgdp) do { } while (0)
-#define set_pgd(pgd,pgdp) do { } while (0)
+#define pud_none(pud) (0)
+#define pud_bad(pud) (0)
+#define pud_present(pud) (1)
+#define pud_clear(pudp) do { } while (0)
#define set_pud(pud,pudp) do { } while (0)


/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir, addr) ((pmd_t *)(dir))
+static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
+{
+ return (pmd_t *)pud;
+}

#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_present(pmd) (pmd_val(pmd))
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index 265f908..b509e44 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -204,6 +204,7 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,

#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
+#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)

#define tlb_migrate_finish(mm) do { } while (0)



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