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

[Sachin Sant]

> On 11-Sep-2023, at 2:44 PM, Aditya Gupta <adityag at linux.ibm.com> wrote:
> 
> 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
> 
> Signed-off-by: Aditya Gupta <adityag at linux.ibm.com>
> ---

Thanks for the patch. With this patch applied (along with makedumpfile changes)
I am able to capture vmcore against a kernel which contains commit 8dc9a0ad0c3e

Reported-by: Sachin Sant <sachinp at linux.ibm.com>
Tested-by: Sachin Sant <sachinp at linux.ibm.com>

- Sachin