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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CB1DDB2@AcuExch.aculab.com>
Date:	Tue, 14 Apr 2015 16:25:24 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Al Viro' <viro@...IV.linux.org.uk>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 16/17] get rid of the size argument of sock_sendmsg()

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.

	David

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