Re: [2.5.20-BUG] 3c59x + highmem + acpi + nfs -> kernel panic

[David S. Miller]

   From: Trond Myklebust <[e-mail]>
   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.