__bitcount
if (state == 0 || __bitcount(state) > 1)
if (__bitcount(flags & (UMTX_SHM_CREAT | UMTX_SHM_LOOKUP |
&& __bitcount(tdp) == 1));
MPASS(__bitcount(flags & (IFP_HS_HANDLED | IFP_HS_REJECTED)) == 1);
#define bitcount(x) __bitcount((u_int)(x))