[FTRACE] Enabling function_graph causes OOPS

[Benjamin Herrenschmidt]

> > .../...
> > 
> > > Something is totally messed up here.
> > 
> > Could it be that we don't handle R_PPC64_ADDR16_* relocs in
> > arch/powerpc/kernel/modules/module_64.c ?
> > 
> > Sachin, do you see a bunch of "Unknown ADD relocation" in your dmesg ?
> 
> Ben,
> 
> The thing is, this is kernel proper. This code is in entry_64.S not in
> the module code.

Argh... indeed.

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 ?

Cheers,
Ben.