[FTRACE] Enabling function_graph causes OOPS

[Benjamin Herrenschmidt]

On Mon, 2009-10-05 at 09:25 -0400, Steven Rostedt wrote:
> > > Sachin, can you give me more details on how you built that kernel ? (or
> > > give them again in case I missed them the first time around :-), ie,
> > > what toolchain, options, etc... or even better, give me remote access to
> > > the build host ?
> > 
> > Ok, got access and had a quick look... seems to be a toolchain problem
> > to me. I'll investigate more tomorrow.
> 
> Hi Ben,
> 
> Any more word on this issue? 

Didn't you fix it using a TOC access ?

Unless I'm confusing things, I think the problem is the usage
of LOAD_REG_IMMEDIATE which generates relocs that we don't support
when CONFIG_RELOCATABLE is set.

I've merged a patch that post-processes the kernel now, to check
for such relocs so at least you should be warned at build time.

Cheers,
Ben.