netdev - Re: [PATCH 16/17] get rid of the size argument of sock

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Message-ID: <20150414163534.GZ889@ZenIV.linux.org.uk>
Date:	Tue, 14 Apr 2015 17:35:34 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 16/17] get rid of the size argument of sock_sendmsg()

On Tue, Apr 14, 2015 at 04:25:24PM +0000, David Laight wrote:
> From: Al Viro
> > Sent: 11 April 2015 22:18
> > it's equal to iov_iter_count(&msg->msg_iter) in all cases
> 
> I don't know whether this is guaranteed for iov[] that come from
> userspace.
>
> In any case iov_iter_count() is non-trivial and you don't
> really want to call it when unnecessary.

Really?

static inline size_t iov_iter_count(struct iov_iter *i)
{
        return i->count;
}
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