[Crash-utility] CONFIG_STRICT_DEVMEM

[Dave Anderson]

----- "Bernhard Walle" <bwalle at suse.de> wrote:

> * Cliff Wickman [2008-11-12 09:54]:
> >
> > 
> > Running on an x86_64 box, with a 2.6.28 kernel, lcrash fails
> > on a failed read of /dev/mem.
> > It is a read to initialize virtop. It fails with EPERM.
> > 
> > The problem is
> >   CONFIG_STRICT_DEVMEM=y
> > 
> > (could this be a problem to crash as well?)
> 
> Yes. I'm working on making that runtime-configurable and hope that
> patch gets accepted upstream.
> 
> 
> Regards,
> Bernhard

And hopefully Bernhard's efforts will work out for non-Red Hat 
users of the crash utility.  

The CONFIG_STRICT_DEVMEM concept has been in place in Red Hat
x86 and x86_64 kernels since RHEL4, which is why the /dev/crash
driver was created to replace /dev/mem for those two architectures.

Dave