[PATCH] ppc32: Wrong vaddr in flush_hash_one_pte()

Reworking the ppc32 mm helps me find interesting bugs in the existing bug,
well, brown paper bag for me, I made this one a while ago.

The routine flush_hash_one_pte() used by ptep_test_and_clear_young()
wasn't properly recaclulating the vaddr from the pte pointer &
page->index.  The result is that we probably never flushed things from
the hash, so that's at least the _second_ bug affecting
ptep_test_and_clear_young(), swap on ppc32 must have been really broken
:(

This fixes it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/mm/tlb.c

@@ -62,7 +62,7 @@ void flush_hash_one_pte(pte_t *ptep)
 	ptepage = virt_to_page(ptep);
 	mm = (struct mm_struct *) ptepage->mapping;
 	ptephys = __pa(ptep) & PAGE_MASK;
-	addr = ptepage->index + (((unsigned long)ptep & ~PAGE_MASK) << 9);
+	addr = ptepage->index + (((unsigned long)ptep & ~PAGE_MASK) << 10);
 	flush_hash_pages(mm->context, addr, ptephys, 1);
 }