From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 16/17] get rid of the size argument of sock_sendmsg()
Date: Tue, 14 Apr 2015 13:55:35 -0400 (EDT)
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From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Tue, 14 Apr 2015 17:35:34 +0100

> 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;
> }

This just made my day.