From: Trond Myklebust <trond.myklebust@fys.uio.no>
Date: Tue, 4 Jun 2002 13:39:32 +0200
>From what I can see, the only other place where KM_USER0 is employed would be
in the *_highpage() helper routines in include/linux/highmem.h. These
routines are used in various places, but are usually not protected against
(soft and hard) interrupts or kernel pre-emption. Could it be that the latter
is what is causing trouble?
Any sort of interrupt whatsoever would be enough to cause a problem
here. It is enough of a condition to allow the sunrpc code to
run.
This has nothing specific to do with preemption, although the fact
that KM_USER0 usage does not block preemption is worrysome.
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