[PATCH] powerpc: add `cur_cpu_spec` symbol to vmcoreinfo

[Aditya Gupta]

On Tue, Sep 19, 2023 at 08:07:15PM +1000, Michael Ellerman wrote:
> Aditya Gupta <adityag at linux.ibm.com> writes:
> > On Thu, Sep 14, 2023 at 11:22:01PM +1000, Michael Ellerman wrote:
> >> Aditya Gupta <adityag at linux.ibm.com> writes:
> >> > Presently, while reading a vmcore, makedumpfile uses
> >> > `cur_cpu_spec.mmu_features` to decide whether the crashed system had
> >> > RADIX MMU or not.
> >> >
> >> > Currently, makedumpfile fails to get the `cur_cpu_spec` symbol (unless
> >> > a vmlinux is passed with the `-x` flag to makedumpfile), and hence
> >> > assigns offsets and shifts (such as pgd_offset_l4) incorrecly considering
> >> > MMU to be hash MMU.
> >> >
> >> > Add `cur_cpu_spec` symbol and offset of `mmu_features` in the
> >> > `cpu_spec` struct, to VMCOREINFO, so that the symbol address and offset
> >> > is accessible to makedumpfile, without needing the vmlinux file
> >> 
> >> This looks fine.
> >> 
> >> Seems like cpu_features would be needed or at least pretty useful too?
> >> 
> >> cheers
> >
> > Sure, that can be added too, to the vmcoreinfo. Not sure if it's used now, but
> > sure it can help to identify features in makedumpfile.
> >
> > Will add it, in next version.
> 
> Please do it in a separate commit to the mmu_features :)
> 
> cheers

Sure, have done it in a separate patch in V2.

Thanks