>   void
>   map_cpus_to_prstatus_kdump_cmprs(void)
>   {
> @@ -131,7 +180,7 @@ map_cpus_to_prstatus_kdump_cmprs(void)
>       nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS);
>   
>       for (i = 0, j = 0; i < nrcpus; i++) {
> -             if (in_cpu_map(ONLINE_MAP, i)) {
> +             if (in_cpu_map(ONLINE_MAP, i) && (!symbol_exists("crash_notes") || have_crash_notes(i))) {

Thank you for the update.

kernel_symbol_exists() is better.
And it might be also good to check it out of the loop only once.
Lianbo, what do you think?

   int crash_notes_exists = kernel_symbol_exists("crash_notes");

Anyway, we can change it when merging, so for the series,
Acked-by: Kazuhito Hagio <k-hagio-ab@nec.com>

Thanks,
Kazu