fix building crash driver on s390

[Dan Horák]

On Tue, 26 Nov 2013 12:33:03 -0500
Josh Boyer <jwboyer at redhat.com> wrote:

> On Tue, Nov 26, 2013 at 06:30:33PM +0100, Dan Horák wrote:
> > On Tue, 26 Nov 2013 08:10:24 -0500
> > Josh Boyer <jwboyer at redhat.com> wrote:
> > 
> > > On Tue, Nov 26, 2013 at 12:31:53PM +0100, Dan Horák wrote:
> > > > Hi,
> > > > 
> > > > currently the crash driver is disabled in rawhide, but enabled
> > > > as module in f20 and stabilization branch. The following
> > > > snippet make it build on s390
> > > > 
> > > > diff -up a/arch/s390/mm/maccess.c.crash b/arch/s390/mm/maccess.c
> > > > --- a/arch/s390/mm/maccess.c.crash	2013-11-26
> > > > 10:51:55.188222879 -0500 +++ b/arch/s390/mm/maccess.c
> > > > 2013-11-26 10:52:43.718223592 -0500 @@ -228,3 +228,6 @@ void
> > > > unxlate_dev_mem_ptr(unsigned long a if ((void *) addr != buf)
> > > >  		free_page((unsigned long) buf);
> > > >  }
> > > > +
> > > > +EXPORT_SYMBOL(xlate_dev_mem_ptr);
> > > > +EXPORT_SYMBOL(unxlate_dev_mem_ptr);
> > > > 
> > > > I think it should get appended to the crash driver patch.
> > > 
> > > Is this something anyone is in a position to test on s390x?  I'm
> > > fine with adding it to the patch, but if nobody is going to use
> > > crash on s390x I'm curious if we should leave it enabled.
> > 
> > crash itself is maintained by IBM for s390x, so I guess we should
> > keep all arches the same when possible. Kyle probably has more
> > information.
> > 
> > I just tried the command from rhbz#492803
> > crash
> > -d7 /usr/lib/debug/lib/modules/3.13.0-0.rc1.git2.1.fc21.s390x/vmlinux
> > on kernel with the crash driver enabled and it works if I can see.
> 
> OK.

please apply 97686d59 also to f20 and stabilization branches


		Dan