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Re: [Qemu-devel] [PATCH] virtio: Make memory barriers be memory barriers

From: David Gibson
Subject: Re: [Qemu-devel] [PATCH] virtio: Make memory barriers be memory barriers
Date: Fri, 2 Sep 2011 10:08:50 +1000
User-agent: Mutt/1.5.21 (2010-09-15)

On Thu, Sep 01, 2011 at 08:47:49AM +0200, Paolo Bonzini wrote:
> On 09/01/2011 08:09 AM, David Gibson wrote:
> >The patch defines wmb() as __sync_synchronize(), a cross platform memory
> >barrier primitive available in sufficiently recent gcc versions (gcc 4.2
> >and after?).  If we care about older gccs then this patch will need to
> >be updated with some sort of fallback.
> Yes, though RHEL5's 4.1 has it backported.
> >Signed-off-by: Alexey Kardashevskiy<address@hidden>
> >Signed-off-by: David Gibson<address@hidden>
> It will most definitely break OpenBSD, but anyway:

Uh, why?

David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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