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| author | Miklos Szeredi <mszeredi@suse.cz> | 2007-03-29 10:20:29 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-29 17:22:24 +0200 |
| commit | 602ed87ecd93a857dc687afb938d2c0f45552986 (patch) | |
| tree | e6c3b134ec527669419df297e2844b93dcfd5255 /include/asm-um | |
| parent | [PATCH] uml: fix device unplug crash (diff) | |
| download | linux-602ed87ecd93a857dc687afb938d2c0f45552986.tar.xz linux-602ed87ecd93a857dc687afb938d2c0f45552986.zip | |
[PATCH] uml: fix pte bit collision
_PAGE_PROTNONE conflicts with the lowest bit of pgoff. This causes all sorts
of weirdness when nonlinear mappings are used.
Took me a good half day to track this down.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Acked-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-um')
| -rw-r--r-- | include/asm-um/pgtable-2level.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-um/pgtable-2level.h b/include/asm-um/pgtable-2level.h index 6050e0eb257e..172a75fde512 100644 --- a/include/asm-um/pgtable-2level.h +++ b/include/asm-um/pgtable-2level.h @@ -45,12 +45,12 @@ static inline void pgd_mkuptodate(pgd_t pgd) { } ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) /* - * Bits 0 through 3 are taken + * Bits 0 through 4 are taken */ -#define PTE_FILE_MAX_BITS 28 +#define PTE_FILE_MAX_BITS 27 -#define pte_to_pgoff(pte) (pte_val(pte) >> 4) +#define pte_to_pgoff(pte) (pte_val(pte) >> 5) -#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE }) +#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE }) #endif |