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powerpc: add cur_cpu_spec
symbol to vmcoreinfo
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@linux.ibm.com> Reported-by: Sachin Sant <sachinp@linux.ibm.com> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230911091409.415662-1-adityag@linux.ibm.com
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@ -63,6 +63,8 @@ void arch_crash_save_vmcoreinfo(void)
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#ifndef CONFIG_NUMA
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VMCOREINFO_SYMBOL(contig_page_data);
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#endif
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VMCOREINFO_SYMBOL(cur_cpu_spec);
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VMCOREINFO_OFFSET(cpu_spec, mmu_features);
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#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
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VMCOREINFO_SYMBOL(vmemmap_list);
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VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
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