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

[Aditya Gupta]

Hello Sachin,

On Wed, Sep 13, 2023 at 06:19:11PM +0530, Sachin Sant wrote:
> 
> 
> > 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>

Thanks for testing this, and for providing the tags.

- Aditya Gupta