ppc32's implementation of ptep_test_and_clear_young() has a logic error
which makes it fail to flush the hash table. Thus PAGE_ACCESSED is
almost never set again after beeing cleared (unless something else cause
that hash entry to be flushed).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>