while we are getting rid of Giant,  current race condition between softclock()
and callout_stop() is unacceptable. the race causes two many places in source
code would be modified to fit this new behaviour,  besides this, everywhere 
callout_stop() is used need to hold sched_lock and do a mi_switch() and
modify td_flags is also unacceptable, this SMP race should be resolved in 

David Xu

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