netdev - Re: [PATCH v3 17/18] vhost: don't bother copying iovecs in handle_rx(), kill memcpy

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Date:	Wed, 4 Feb 2015 10:02:27 +0100
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 17/18] vhost: don't bother copying iovecs in
 handle_rx(), kill memcpy_toiovecend()

>  		if (likely(mergeable) &&
> -		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
> -				      offsetof(typeof(hdr), num_buffers),
> -				      sizeof hdr.num_buffers)) {
> +		    copy_to_iter(&headcount, 2, &fixup) != 2) {
>  			vq_err(vq, "Failed num_buffers write");
>  			vhost_discard_vq_desc(vq, headcount);
>  			break;

BTW this will have to be re-based on top of
http://mid.gmane.org/1422896842-19186-1-git-send-email-mst@redhat.com
taking byte-swap into account.
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