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Date: Mon, 1 Dec 2014 13:20:51 +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, Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org Subject: Re: [PATCH v7 30/46] vhost/net: force len for TX to host endian On Sun, 30 Nov 2014 17:11:44 +0200 "Michael S. Tsirkin" <mst@...hat.com> wrote: > vhost/net keeps a copy of some used ring but (ab)uses length > field for internal house-keeping. This works because > for tx used length is always 0. > Suppress sparse errors: we use native endian-ness internally but never > expose it to guest. I admit that I find this patch description hard to read :) "vhost/net keeps a copy of the used ring in host memory but (ab)uses the length field for internal house-keeping. This works because the length in the used ring for tx is always 0. In order to suppress sparse errors, we need to force native endianness." ? > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com> > Reviewed-by: Jason Wang <jasowang@...hat.com> > --- > drivers/vhost/net.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 8dae2f7..dce5c58 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -48,15 +48,15 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" > * status internally; used for zerocopy tx only. > */ > /* Lower device DMA failed */ > -#define VHOST_DMA_FAILED_LEN 3 > +#define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) > /* Lower device DMA done */ > -#define VHOST_DMA_DONE_LEN 2 > +#define VHOST_DMA_DONE_LEN ((__force __virtio32)2) > /* Lower device DMA in progress */ > -#define VHOST_DMA_IN_PROGRESS 1 > +#define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) > /* Buffer unused */ > -#define VHOST_DMA_CLEAR_LEN 0 > +#define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) > > -#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN) > +#define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) > > enum { > VHOST_NET_FEATURES = VHOST_FEATURES | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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