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| author |   Nick Piggin <npiggin@suse.de> | 2008-07-27 20:28:03 -0700 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-28 16:30:52 +1000 |
| commit | 83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d (patch) | |
| tree | f29cf4d1b3b6f859ead2598c9d741ffc5a56ec8b /include/asm-powerpc/pgtable-64k.h | |
| parent | powerpc: Show processor cache information in sysfs (diff) | |
| download | linux-dev-83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d.tar.xz linux-dev-83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d.zip | |
powerpc/mm: Implement _PAGE_SPECIAL & pte_special() for 64-bit
Implement _PAGE_SPECIAL and pte_special() for 64-bit powerpc. This bit will
be used by the fast get_user_pages() to differenciate PTEs that correspond
to a valid struct page from special mappings that don't such as IO mappings
obtained via io_remap_pfn_ranges().
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/asm-powerpc/pgtable-64k.h')
| -rw-r--r-- | include/asm-powerpc/pgtable-64k.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-powerpc/pgtable-64k.h b/include/asm-powerpc/pgtable-64k.h index 7e54adb35596..07b0d8f09cb6 100644 --- a/include/asm-powerpc/pgtable-64k.h +++ b/include/asm-powerpc/pgtable-64k.h @@ -70,6 +70,8 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* Additional PTE bits (don't change without checking asm in hash_low.S) */ +#define __HAVE_ARCH_PTE_SPECIAL +#define _PAGE_SPECIAL 0x00000400 /* software: special page */ #define _PAGE_HPTE_SUB 0x0ffff000 /* combo only: sub pages HPTE bits */ #define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */ #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */ |