linux-kernel - Re: [PATCH v5 1/8] virtio: introduce virtio_is_little

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Message-ID: <20150423192613.6c58042f@thh440s>
Date:	Thu, 23 Apr 2015 19:26:13 +0200
From:	Thomas Huth <thuth@...hat.com>
To:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v5 1/8] virtio: introduce virtio_is_little_endian()
 helper

Am Thu, 23 Apr 2015 19:22:15 +0200
schrieb Thomas Huth <thuth@...hat.com>:

> Am Thu, 23 Apr 2015 17:26:20 +0200
> schrieb Greg Kurz <gkurz@...ux.vnet.ibm.com>:
> 
> > Signed-off-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
> > ---
> >  include/linux/virtio_config.h |   17 +++++++++++------
> >  1 file changed, 11 insertions(+), 6 deletions(-)
> > 
> > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> > index ca3ed78..bd1a582 100644
> > --- a/include/linux/virtio_config.h
> > +++ b/include/linux/virtio_config.h
> > @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
> >  	return 0;
> >  }
> >  
> > +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
> > +{
> > +	return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
> > +}
> 
> So this function returns false when _not_ using version 1, but running
> on a little endian host + guest? Sounds confusing. Maybe you could name
> it "virtio_is_v1()" or so instead?

Ah, never mind, I should have looked at patch 6 first, then it makes
sense. (maybe you could put a note to the later patch in this patch
description?)

 Thomas
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