Re: [dm-devel] [PATCH] Remove the spinlock protecting the pages allocation

[Joe Thornber <thornber redhat com>]

On Thu, 2011-05-19 at 12:58 -0400, Mikulas Patocka wrote:
> The spinlock is only taken on initialization or from single-threaded
> workqueue.
> Therefore, the spinlock is useless. 

The spinlock has memory barrier semantics as well.  How are you
guaranteeing the changes from the initialisation thread are visible in
the workqueue thread?

- Joe