SPCF_PROFCLOCK
atomic_setbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
if (ISSET(spc->spc_schedflags, SPCF_PROFCLOCK)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
if (ISSET(spc->spc_schedflags, SPCF_PROFCLOCK)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
atomic_setbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);