can a process be reschedule during system call

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If during a system call, a process's time quota is depleted, will it
immediately be preempted or delayed until system call is finished?
If it's the latter case, why we need 'partial_writers' variable to protect
multiple writers with partial packets in tcp_do_sendmsg(), since only one
process can be in the kernel mode at one time. Thanks.

rz
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