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[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>
This commit is contained in:
Miklos Szeredi 2007-03-29 01:20:29 -07:00 committed by Linus Torvalds
parent d40f6d71da
commit 602ed87ecd
1 changed files with 4 additions and 4 deletions
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8
include/asm-um/pgtable-2level.h
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@ -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