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

From: Michael Ellerman <[email-masked]>
Date: Thu, 14 Sep 2023 23:22:40 +1000

Sachin Sant <[email-masked]> writes:
>> On 11-Sep-2023, at 2:44 PM, Aditya Gupta <[email-masked]> 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 <[email-masked]>
>> ---
>
> 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

I can't find that commit? Was just wondering if it should be referenced
in the commit message.

cheers