From mboxrd@z Thu Jan  1 00:00:00 1970
From: William Allen Simpson <william.allen.simpson@gmail.com>
Subject: Re: [net-next-2.6 PATCH v4 2/3] TCPCT part 1b: sysctl_tcp_cookie_size,
 socket option TCP_COOKIE_TRANSACTIONS, functions
Date: Mon, 02 Nov 2009 05:45:22 -0500
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References: <4AE6E35C.2050101@gmail.com> <4AE6E529.706@gmail.com> <4AEDDDF3.3070102@gmail.com>
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Cc: Linux Kernel Network Developers <netdev@vger.kernel.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
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Eric Dumazet wrote:
> William Allen Simpson a =E9crit :
>> These functions will also be used in subsequent patches that impleme=
nt
>> additional features.
>>
>=20
> +#define TCP_EXTEND_TIMESTAMP	(1 << 4)	/* Initiate 64-bit timestamps =
*/
>=20
> What is this for ?
>=20
Reserving a bit in the sockopt for a future feature (described in the
aforementioned end2end-interest email messages).

Certainly, reserving bits seems to be common elsewhere in Linux code.  =
I'm
trying to coordinate this with the *BSD developers, too, so it helps to=
 keep
API documentation synchronized.  Is that a problem?