UNWIND_PENDING
if (bits & UNWIND_PENDING)
bits = atomic_long_fetch_andnot(UNWIND_PENDING,
bits = UNWIND_PENDING | bit;
WARN_ON_ONCE(!(old & UNWIND_PENDING));
#define RESERVED_BITS (UNWIND_PENDING | UNWIND_USED)
return atomic_long_read(&info->unwind_mask) & UNWIND_PENDING;