[Crash-utility] Why are there two ways of getting register values for active tasks?

[Daisuke HATAYAMA]

Hi, all.

I have a question on the implementation of get_netdump_regs_x86_64().

Currently, in order to get register values for active tasks, only
panic task makes use of note information. On the other hand, other
active tasks search stack frame for registers saved at nmi
switch. However, crash dump contains the note information for every
CPUs, so I think it uncessary to search stack frame.

Could anyone tell me why here is implemented this way?

Thanks.
HATAYAMA, Daisuke