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authorMiklos Szeredi <mszeredi@suse.cz>2007-03-29 04:20:29 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-29 11:22:24 -0400
commit602ed87ecd93a857dc687afb938d2c0f45552986 (patch)
treee6c3b134ec527669419df297e2844b93dcfd5255 /include/asm-um
parentd40f6d71da81deb66c4fa54b46e22977cdb8b451 (diff)
[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.h8
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) { }
45 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) 45 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
46 46
47/* 47/*
48 * Bits 0 through 3 are taken 48 * Bits 0 through 4 are taken
49 */ 49 */
50#define PTE_FILE_MAX_BITS 28 50#define PTE_FILE_MAX_BITS 27
51 51
52#define pte_to_pgoff(pte) (pte_val(pte) >> 4) 52#define pte_to_pgoff(pte) (pte_val(pte) >> 5)
53 53
54#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE }) 54#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })
55 55
56#endif 56#endif