checkfreelist
KDASSERT(checkfreelist(bp, &bufqueues[BQ_LRU], 1));
KDASSERT(checkfreelist(bp, &bufqueues[BQ_AGE], 0));
KDASSERT(checkfreelist(bp, &bufqueues[BQ_LRU], 0));
KDASSERT(checkfreelist(bp, &bufqueues[BQ_LOCKED], 0));
static int checkfreelist(buf_t *, struct bqueue *, int);
KDASSERT(checkfreelist(bp, dp, 1));