ptr_stale
EBUG_ON(ptr_stale(c, &b->key, i));
if (ptr_stale(c, k, i)) {
stale = max(stale, ptr_stale(c, k, i));
!ptr_stale(c, k, i)) {
ptr_stale(b->c, k, i))
stale = ptr_stale(b->c, k, i);
if (ptr_stale(c, k, i))
if (ptr_stale(c, &w->key, 0)) {
ptr_stale(io->op.c, &b->key, 0)) {
ptr_stale(s->iop.c, &b->key, 0)) {
BUG_ON(ptr_stale(dc->disk.c, &next->key, 0));