linux-kernel - Re: [PATCH v7 28/46] vhost: make features 64 bit

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Message-ID: <20141201091940.GB15607@redhat.com>
Date:	Mon, 1 Dec 2014 11:19:40 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	cornelia.huck@...ibm.com, rusty@....ibm.com, nab@...ux-iscsi.org,
	pbonzini@...hat.com, thuth@...ux.vnet.ibm.com,
	dahi@...ux.vnet.ibm.com, Jason Wang <jasowang@...hat.com>,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v7 28/46] vhost: make features 64 bit

On Mon, Dec 01, 2014 at 04:12:37AM +0000, Ben Hutchings wrote:
> On Sun, 2014-11-30 at 18:44 +0300, Sergei Shtylyov wrote:
> > Hello.
> > 
> > On 11/30/2014 6:11 PM, Michael S. Tsirkin wrote:
> > 
> > > We need to use bit 32 for virtio 1.0
> > 
> > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > Reviewed-by: Jason Wang <jasowang@...hat.com>
> > > ---
> > >   drivers/vhost/vhost.h | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> > > index 3eda654..c624b09 100644
> > > --- a/drivers/vhost/vhost.h
> > > +++ b/drivers/vhost/vhost.h
> > > @@ -106,7 +106,7 @@ struct vhost_virtqueue {
> > >   	/* Protected by virtqueue mutex. */
> > >   	struct vhost_memory *memory;
> > >   	void *private_data;
> > > -	unsigned acked_features;
> > > +	u64 acked_features;
> > >   	/* Log write descriptors */
> > >   	void __user *log_base;
> > >   	struct vhost_log *log;
> > > @@ -174,6 +174,6 @@ enum {
> > >
> > >   static inline int vhost_has_feature(struct vhost_virtqueue *vq, int bit)
> > >   {
> > > -	return vq->acked_features & (1 << bit);
> > > +	return vq->acked_features & (1ULL << bit);
> > 
> >     Erm, wouldn't the high word be just dropped when returning *int*? I think 
> > you need !!(vq->acked_features & (1ULL << bit)).
> 
> Or change the return type to bool.
> 
> Ben.
> 
> -- 
> Ben Hutchings
> The first rule of tautology club is the first rule of tautology club.



Yes, I'll do that I think.
Thanks!

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