Re: [PATCH v2 -mm 2/2] current_is_single_threaded: don't use->mmap_sem

[James Morris]

On Fri, 10 Jul 2009, David Howells wrote:

> > However we can avoid ->mmap_sem and rely on rcu/barriers:
> > 
> > 	- if we do not see the exiting parent on thread/process list
> > 	  we see the result of list_del_rcu(), in this case we must
> > 	  also see the result of list_add_rcu() which does wmb().
> > 
> > 	- if we do see the parent but its ->mm == NULL, we need rmb()
> > 	  to make sure we can't miss the child.
> > 
> > Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
> 
> Acked-by: David Howells <dhowells@xxxxxxxxxx>

I gather this stuff is going into -mm ?

Can it be merged via security-testing#next?

-- 
James Morris
<jmorris@xxxxxxxxx>
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