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

Hari Bathini hbathini at linux.ibm.com
Fri Sep 15 16:15:43 AEST 2023

On 14/09/23 6:52 pm, 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?

Yeah. Would be nice to have access to that, to accurately identify the
kind of system vmcore was generated for.


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