linux-kernel - [RFC v2][PATCH 26/35] frv: use pte_offset_kernel() as base for pte_offset

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Date:	Wed, 20 May 2009 11:25:26 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	linux-arch@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: [RFC v2][PATCH 26/35] frv: use pte_offset_kernel() as base for pte_offset_map*()


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.

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

 linux-2.6.git-dave/arch/frv/include/asm/highmem.h |    5 +++++
 linux-2.6.git-dave/arch/frv/include/asm/ptemap.h  |    5 ++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff -puN arch/frv/include/asm/highmem.h~frv-pte_offset_kernel arch/frv/include/asm/highmem.h
--- linux-2.6.git/arch/frv/include/asm/highmem.h~frv-pte_offset_kernel	2009-04-30 15:11:08.000000000 -0700
+++ linux-2.6.git-dave/arch/frv/include/asm/highmem.h	2009-04-30 15:11:08.000000000 -0700
@@ -42,6 +42,11 @@ extern unsigned long highstart_pfn, high
 
 #define kmap_prot PAGE_KERNEL
 #define kmap_pte ______kmap_pte_in_TLB
+/*
+ * This lets us share the highpte pte_offset_map()
+ * with x86
+ */
+#define kmap_atomic_pte(page, type)     kmap_atomic(page, type)
 extern pte_t *pkmap_page_table;
 
 #define flush_cache_kmaps()  do { } while (0)
diff -puN arch/frv/include/asm/ptemap.h~frv-pte_offset_kernel arch/frv/include/asm/ptemap.h
--- linux-2.6.git/arch/frv/include/asm/ptemap.h~frv-pte_offset_kernel	2009-04-30 15:11:08.000000000 -0700
+++ linux-2.6.git-dave/arch/frv/include/asm/ptemap.h	2009-04-30 15:11:08.000000000 -0700
@@ -9,9 +9,8 @@
 #define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0)
 #define pte_unmap_nested(pte) kunmap_atomic((pte), KM_PTE1)
 #else
-#define pte_offset_map(dir, address) \
-	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
-#define pte_offset_map_nested(dir, address) pte_offset_map((dir), (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) do { } while (0)
 #define pte_unmap_nested(pte) do { } while (0)
 #endif
_
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