[PATCH] [RFC] sh: kexec: Register crashk_res

[Simon Horman]

On Mon, Sep 05, 2011 at 12:23:53PM +0900, Paul Mundt wrote:
> On Fri, Sep 02, 2011 at 12:47:12PM +0900, Simon Horman wrote:
> > Register crashk_res so that it can be used by kexec-tools
> > via /proc/iomem.
> > 
> > On x86 the registration occurs using
> > insert_resource(&iomem_resource, &crashk_res).
> > However that approach seems to result in the boot hanging on SH.
> > 
> > Signed-off-by: Simon Horman <horms at verge.net.au>
> 
> x86 has a slightly more straightforward registration method. We end up
> going through the same path for all memory ranges, which also
> encapsulates the NUMA case. As such, we don't necessarily know which
> range will contain the resource in question, so it's attempted on each
> range addition, expecting the resource manager to work things out for us.
> 
> With the request_resource() in place you presumably see the crash kernel
> resource where you expect it to in /proc/iomem?

Yes. With this patch in place the crash kernel resource
shows up in /proc/iomem in a sensible way.

# cat /proc/iomem 
40000000-4effffff : System RAM
 40001000-402dbfc7 : Kernel code
 402dbfc8-403cd51f : Kernel data
 40553000-40568c5b : Kernel bss
 4d000000-4effffff : Crash kernel
...