[RFC][PATCH 34/35] powerpc use generic ptemap.h

[Dave Hansen]

powerpc is a bid of an oddball here.  It seems to have CONFIG_HIGHPTE
behavior at all times when compiled as 32-bit.  There's even an
#ifdef CONFIG_HIGHPTE in arch/powerpc/mm/pgtable_32.c, but there's no
trace of HIGHPTE in Kconfig anywhere.

This gives ppc32 an explicit HIGHPTE in Kconfig so that we can use
the #ifdef in asm-generic/ptemap.h and let ppc use the generic code
with x86 and frv.

Signed-off-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
---

 linux-2.6.git-dave/arch/powerpc/Kconfig              |    4 ++++
 linux-2.6.git-dave/arch/powerpc/include/asm/ptemap.h |   18 ++++++------------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff -puN arch/powerpc/include/asm/ptemap.h~powerpc-pte_offset_kernel arch/powerpc/include/asm/ptemap.h
--- linux-2.6.git/arch/powerpc/include/asm/ptemap.h~powerpc-pte_offset_kernel	2009-04-30 15:11:13.000000000 -0700
+++ linux-2.6.git-dave/arch/powerpc/include/asm/ptemap.h	2009-04-30 15:11:13.000000000 -0700
@@ -2,19 +2,13 @@
 #define _POWERPC_ASM_PTEMAP_H
 
 #ifndef __powerpc64__
-
-#define pte_offset_map(dir, addr)		\
-	((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr))
-#define pte_offset_map_nested(dir, addr)	\
-	((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE1) + pte_index(addr))
-
-#define pte_unmap(pte)		kunmap_atomic(pte, KM_PTE0)
-#define pte_unmap_nested(pte)	kunmap_atomic(pte, KM_PTE1)
-
-#else /* __powerpc64__ */
+/*
+ * This lets us use the x86 implementation
+ * in the generic ptemap.h
+ */
+#define kmap_atomic_pte(page, type) kmap_atomic(page, type)
+#endif
 
 #include <asm-generic/ptemap.h>
 
-#endif
-
 #endif /* _POWERPC_ASM_PTEMAP_H */
diff -puN arch/powerpc/Kconfig~powerpc-pte_offset_kernel arch/powerpc/Kconfig
--- linux-2.6.git/arch/powerpc/Kconfig~powerpc-pte_offset_kernel	2009-04-30 15:11:13.000000000 -0700
+++ linux-2.6.git-dave/arch/powerpc/Kconfig	2009-04-30 15:11:13.000000000 -0700
@@ -244,6 +244,10 @@ config HIGHMEM
 	bool "High memory support"
 	depends on PPC32
 
+config HIGHPTE
+	def_bool y
+	depends on HIGHMEM
+
 source kernel/time/Kconfig
 source kernel/Kconfig.hz
 source kernel/Kconfig.preempt
_
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