Subject: Re: [PATCH] vhost-net: switch to smp barriers

From: Rusty Russell <[email-masked]>
Date: Mon, 8 Feb 2010 18:49:39 +1030

On Sun, 7 Feb 2010 07:37:49 pm Michael S. Tsirkin wrote:
> On Mon, Feb 01, 2010 at 07:21:02PM +0200, Michael S. Tsirkin wrote:
> > vhost-net only uses memory barriers to control SMP effects
> > (communication with userspace potentially running on a different CPU),
> > so it should use SMP barriers and not mandatory barriers for memory
> > access ordering, as suggested by Documentation/memory-barriers.txt
> > 
> > Signed-off-by: Michael S. Tsirkin <[email-masked]>
> 
> 
> Rusty, any feedback on this one?
> Thanks!

Yep.  barrier() is correct on UP to guard against preemption.

Acked-by: Rusty Russell <[email-masked]>

Thanks,
Rusty.