prev_inuse

    prev_inuse      1570 modules/up/src/Core/gnu/malloc.c     assert(prev_inuse(p));
    prev_inuse      1597 modules/up/src/Core/gnu/malloc.c   if (!prev_inuse(p))
    prev_inuse      1605 modules/up/src/Core/gnu/malloc.c     assert(prev_inuse(next));
    prev_inuse      1635 modules/up/src/Core/gnu/malloc.c   assert(prev_inuse(p));
    prev_inuse      2523 modules/up/src/Core/gnu/malloc.c     if (!prev_inuse(oldp))