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Message-ID: <20141128134457.37e427ce.cornelia.huck@de.ibm.com>
Date: Fri, 28 Nov 2014 13:44:57 +0100
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
Rusty Russell <rusty@...tcorp.com.au>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Amit Shah <amit.shah@...hat.com>,
Ohad Ben-Cohen <ohad@...ery.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Ashutosh Dixit <ashutosh.dixit@...el.com>,
Nikhil Rao <nikhil.rao@...el.com>,
Siva Yerramreddy <yshivakrishna@...il.com>,
Joel Stanley <joel@....id.au>,
virtualization@...ts.linux-foundation.org, lguest@...ts.ozlabs.org,
linux-s390@...r.kernel.org
Subject: Re: [PATCH v6 02/46] virtio: use u32, not bitmap for features
On Thu, 27 Nov 2014 22:07:41 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:
> It seemed like a good idea to use bitmap for features
> in struct virtio_device, but it's actually a pain,
> and seems to become even more painful when we get more
> than 32 feature bits. Just change it to a u32 for now.
>
> Based on patch by Rusty.
>
> Suggested-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index d34ebfa..ab95a4c 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -120,8 +120,7 @@ static void vp_finalize_features(struct virtio_device *vdev)
> vring_transport_features(vdev);
>
> /* We only support 32 feature bits. */
I think you can kill this comment...
> - BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
> - iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
> + iowrite32(vdev->features, vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
...and add blanks around '+', as you're touching this line anyway.
> }
>
> /* virtio config->get() implementation */
Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>
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