x86: implement pte_special

Implement the pte_special bit for x86.  This is required to support
lockless get_user_pages, because we need to know whether or not we can
refcount a particular page given only its pte (and no vma).

[[email protected]: fix a BUG]
Signed-off-by: Nick Piggin <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: Badari Pulavarty <[email protected]>
Cc: Zach Brown <[email protected]>
Cc: Jens Axboe <[email protected]>
Reviewed-by: Peter Zijlstra <[email protected]>
Signed-off-by: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions