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From: ron@BRL.ARPA (Ron Natalie)
Newsgroups: comp.unix.wizards
Subject: Re:  copyin
Message-ID: <4849@brl-adm.ARPA>
Date: Tue, 10-Mar-87 12:28:10 EST
Article-I.D.: brl-adm.4849
Posted: Tue Mar 10 12:28:10 1987
Date-Received: Wed, 11-Mar-87 00:43:31 EST
Sender: news@brl-adm.ARPA
Lines: 8

Sure, on a 780, the user space of the current process is mapped
in at that stage in system call executions.  You only need to do
the copyin/out when you want to get at user data asynchronously
(i.e. u does not reference the process you are referring to) or
if your machine architecture is such that you don't map the USER
space when the kernel is executing.

-Ron