linux-kernel - Re: [PATCH v4 25/42] vhost: add memory access wrappers

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Message-ID: <20141126140539.GA5528@redhat.com>
Date:	Wed, 26 Nov 2014 16:05:39 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v4 25/42] vhost: add memory access wrappers

On Wed, Nov 26, 2014 at 02:54:38PM +0100, Cornelia Huck wrote:
> On Tue, 25 Nov 2014 18:43:10 +0200
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
> 
> "These wrappers are needed to handle virtio endianness conversions."
> 
> ?

yes, it's same as virtio ones. I'll add this text, thanks.

> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  drivers/vhost/vhost.h | 33 ++++++++++++++++++++++++++++++++-
> >  1 file changed, 32 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> > index 3eda654..b9032e8 100644
> > --- a/drivers/vhost/vhost.h
> > +++ b/drivers/vhost/vhost.h
> > @@ -174,6 +174,37 @@ 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);
> 
> Should this hunk go into patch 28?

Well, this is needed here since 1 << 32 is not legal C.

I can move it - this means patch 28 will have to move earlier
in series though.



> > +}
--
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