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| author | Nick Piggin <npiggin@suse.de> | 2008-07-28 03:28:03 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-28 06:30:52 (GMT) |
| commit | 83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d (patch) | |
| tree | f29cf4d1b3b6f859ead2598c9d741ffc5a56ec8b /include/asm-powerpc/pgtable-4k.h | |
| parent | 124c27d375f72dd857eac27f2932f9f01df76bf4 (diff) | |
| download | linux-fsl-qoriq-83ac6a1ed40bfbe185cf2bac5505d8d97aad8b1d.tar.xz | |
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-4k.h')
| -rw-r--r-- | include/asm-powerpc/pgtable-4k.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-powerpc/pgtable-4k.h b/include/asm-powerpc/pgtable-4k.h index c9601df..6b18ba9 100644 --- a/include/asm-powerpc/pgtable-4k.h +++ b/include/asm-powerpc/pgtable-4k.h @@ -46,6 +46,8 @@ #define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */ #define _PAGE_F_SECOND _PAGE_SECONDARY #define _PAGE_F_GIX _PAGE_GROUP_IX +#define _PAGE_SPECIAL 0x10000 /* software: special page */ +#define __HAVE_ARCH_PTE_SPECIAL /* PTE flags to conserve for HPTE identification */ #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \ |