[PATCH 06/19] list: add a new LRU list type

[Christoph Hellwig]

On Wed, Nov 28, 2012 at 10:14:33AM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> Several subsystems use the same construct for LRU lists - a list
> head, a spin lock and and item count. They also use exactly the same
> code for adding and removing items from the LRU. Create a generic
> type for these LRU lists.
> 
> This is the beginning of generic, node aware LRUs for shrinkers to
> work with.

Can you please add kerneldoc comments for the functions, and add
symbolic constants for the possible return values from the isolate
callback?