[Crash-utility] ARM SMP

[Per Fransson]

> Might be something to do with different crashdump formats supported
> by crash or perhaps some historic reason? Dave, any comments on this?
>
> Looking history for the kernel/kexec.c shows that crash_notes has
> been there from the early days of the kexec code.
>

Just to elaborate a little bit:

The crash_notes which end up in the ELF notes, e.g. when collecting
the core dump through /proc/vmcore on x86, are just copies of the ones
in kernel/kexec.c. They are located by /proc/vmcore using the ELF
header that kexec-tools creates. kexec-tools figures out the addresses
to the crash_notes by reading

/sys/devices/system/cpu/cpu%d/crash_notes

or an equivalent file. But why go though all that trouble if they are
available within the dump anyway?

/Per