[PATCH 1/2] resource: add walk_system_ram_res_rev()

[Andrew Morton]

On Fri, 23 Mar 2018 08:58:45 +0800 Baoquan He <bhe at redhat.com> wrote:

> > erk, this is pretty nasty.  Isn't there a better way :(
> 
> Yes, this is not efficient.
> 
> In struct resource{}, ->sibling list is a singly linked list. I ever
> thought about changing it to doubly linked list, yet not very sure if
> it will have effect since struct resource is a core data structure.

Switching to a list_head sounds OK.  The only issue really is memory
consumption and surely we don't have tens of thousands of struct
resources floating about(?).  Or if we do have a lot, the machine is
presumably huge (hope?).

> AKASHI's method is more acceptable, and currently only kexec has this
> requirement.

What method is that?