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Subject[RFC v2][PATCH 28/35] mips: use pte_offset_kernel() as base for pte_offset_map*()
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Some architectures use pte_offset_map() as a basis for
pte_offset_kernel(). Others do the inverse.

Although arbitrary, Using pte_offset_kernel() as the base
seems a wee bit more popular and it also fits in well
with the way I'm breaking out the headers.

Instead of coding the same implementation twice, this
makes pte_offset_map{,_nested}() call pte_offset_kernel()
directly.

On MIPS, it is also obvious at this point that the 32 and
64-bit implementations are identical. Coalesce them.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---

linux-2.6.git-dave/arch/mips/include/asm/pgtable-32.h | 3 +--
linux-2.6.git-dave/arch/mips/include/asm/pgtable-64.h | 3 +--
linux-2.6.git-dave/arch/mips/include/asm/ptemap.h | 17 ++---------------
3 files changed, 4 insertions(+), 19 deletions(-)

diff -puN arch/mips/include/asm/pgtable-32.h~mips-pte_offset_kernel arch/mips/include/asm/pgtable-32.h
--- linux-2.6.git/arch/mips/include/asm/pgtable-32.h~mips-pte_offset_kernel 2009-04-30 15:11:09.000000000 -0700
+++ linux-2.6.git-dave/arch/mips/include/asm/pgtable-32.h 2009-04-30 15:11:09.000000000 -0700
@@ -149,8 +149,7 @@ pfn_pte(unsigned long pfn, pgprot_t prot
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset(dir, address) \
((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_kernel(dir, address) \
- ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
+#define pte_offset_kernel(dir, address) pte_offset(dir, address)
#include <asm/ptemap.h>

#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
diff -puN arch/mips/include/asm/pgtable-64.h~mips-pte_offset_kernel arch/mips/include/asm/pgtable-64.h
--- linux-2.6.git/arch/mips/include/asm/pgtable-64.h~mips-pte_offset_kernel 2009-04-30 15:11:09.000000000 -0700
+++ linux-2.6.git-dave/arch/mips/include/asm/pgtable-64.h 2009-04-30 15:11:09.000000000 -0700
@@ -213,8 +213,7 @@ static inline pmd_t *pmd_offset(pud_t *
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset(dir, address) \
((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_kernel(dir, address) \
- ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
+#define pte_offset_kernel(dir, address) pte_offset(dir, address)
#include <asm/ptemap.h>
/*
* Initialize a new pgd / pmd table with invalid pointers.
diff -puN arch/mips/include/asm/ptemap.h~mips-pte_offset_kernel arch/mips/include/asm/ptemap.h
--- linux-2.6.git/arch/mips/include/asm/ptemap.h~mips-pte_offset_kernel 2009-04-30 15:11:09.000000000 -0700
+++ linux-2.6.git-dave/arch/mips/include/asm/ptemap.h 2009-04-30 15:11:09.000000000 -0700
@@ -1,22 +1,9 @@
#ifndef _MIPS_ASM_PTEMAP_H
#define _MIPS_ASM_PTEMAP_H

-#ifdef CONFIG_32BIT
-#define pte_offset_map(dir, address) \
- ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-#define pte_offset_map_nested(dir, address) \
- ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
+#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
+#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
#define pte_unmap(pte) ((void)(pte))
#define pte_unmap_nested(pte) ((void)(pte))
-#endif
-
-#ifdef CONFIG_64BIT
-#define pte_offset_map(dir, address) \
- ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-#define pte_offset_map_nested(dir, address) \
- ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-#define pte_unmap(pte) ((void)(pte))
-#define pte_unmap_nested(pte) ((void)(pte))
-#endif

#endif /* _MIPS_ASM_PTEMAP_H */
_

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