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Subject[RFC v2][PATCH 34/35] powerpc use generic ptemap.h
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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.

It also removes the HIGHPTE #ifdef on ppc32 since it will be on
unconditionally.

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

linux-2.6.git-dave/arch/powerpc/Kconfig | 14 ++++++++++++++
linux-2.6.git-dave/arch/powerpc/include/asm/ptemap.h | 14 ++------------
linux-2.6.git-dave/arch/powerpc/mm/pgtable_32.c | 4 ----
linux-2.6.git-dave/orphan.dir/ptemap-overview.txt | 5 +++++
4 files changed, 21 insertions(+), 16 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 2009-05-20 10:58:56.000000000 -0700
+++ linux-2.6.git-dave/arch/powerpc/include/asm/ptemap.h 2009-05-20 10:58:56.000000000 -0700
@@ -2,19 +2,9 @@
#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__ */
+#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 2009-05-20 10:58:56.000000000 -0700
+++ linux-2.6.git-dave/arch/powerpc/Kconfig 2009-05-20 11:05:58.000000000 -0700
@@ -248,6 +248,20 @@ config HIGHMEM
bool "High memory support"
depends on PPC32

+config HIGHPTE
+ bool "Put PTE pages in high memory"
+ default n
+ depends on HIGHMEM && 6xx && EXPERIMENTAL
+ ---help---
+ The VM uses one page table entry for each page of physical memory.
+ For 32-bit systems with a lot of RAM, this can be wasteful of
+ precious low memory. Setting this option will put user-space page
+ table entries in high memory.
+
+ This option is highly experimental. Do not enable unless you are
+ testing the VM.
+
+
source kernel/time/Kconfig
source kernel/Kconfig.hz
source kernel/Kconfig.preempt
diff -puN arch/powerpc/mm/pgtable_32.c~powerpc-pte_offset_kernel arch/powerpc/mm/pgtable_32.c
--- linux-2.6.git/arch/powerpc/mm/pgtable_32.c~powerpc-pte_offset_kernel 2009-05-20 10:58:56.000000000 -0700
+++ linux-2.6.git-dave/arch/powerpc/mm/pgtable_32.c 2009-05-20 10:58:56.000000000 -0700
@@ -114,11 +114,7 @@ pgtable_t pte_alloc_one(struct mm_struct
{
struct page *ptepage;

-#ifdef CONFIG_HIGHPTE
gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT | __GFP_ZERO;
-#else
- gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
-#endif

ptepage = alloc_pages(flags, 0);
if (!ptepage)

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