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powerpc: add cur_cpu_spec symbol to vmcoreinfo

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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
This commit is contained in:
Aditya Gupta
2023-09-11 14:44:09 +05:30
committed by Michael Ellerman
parent f84b727d13
commit 7135b921b3
1 changed files with 2 additions and 0 deletions
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arch/powerpc/kexec/core.c
+2
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@@ -63,6 +63,8 @@ void arch_crash_save_vmcoreinfo(void)
#ifndef CONFIG_NUMA
VMCOREINFO_SYMBOL(contig_page_data);
#endif
VMCOREINFO_SYMBOL(cur_cpu_spec);
VMCOREINFO_OFFSET(cpu_spec, mmu_features);
#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
VMCOREINFO_SYMBOL(vmemmap_list);
VMCOREINFO_SYMBOL(mmu_vmemmap_psize);