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authorMiklos Szeredi <mszeredi@suse.cz>2007-03-29 01:20:29 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-29 08:22:24 -0700
commit602ed87ecd93a857dc687afb938d2c0f45552986 (patch)
treee6c3b134ec527669419df297e2844b93dcfd5255
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>
-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 6050e0eb257..172a75fde51 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