linux-kernel - Re: hardware time stamping with optional structs in data area

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Date:	Mon, 26 Jan 2009 21:39:52 +0100
From:	Patrick Ohly <patrick.ohly@...el.com>
To:	David Miller <davem@...emloft.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: hardware time stamping with optional structs in data area

On Mon, 2009-01-26 at 07:04 +0200, David Miller wrote:
> From: Patrick Ohly <patrick.ohly@...el.com>
> Date: Wed, 21 Jan 2009 11:07:37 +0100
> See fs/compat_ioctl.c:dev_ifsioc() for how to handle the
> "32-bit process under 64-bit kernel" issue wrt. struct ifreq

Thanks, will do.

> Just consolidate the array into a direct conversion table.  You only
> have 2 bits defined so you only need an array of 4 entries.  Pass the
> optional flag bits directly in as the index of that table.

How can I get some code executed during the initialization of the IP
stack which initializes the table, before any sk_buff gets allocated?

The content is constant, but writing it down as static initializers
using just preprocessor macros would be difficult and/or ugly - that's
why I haven't done it already.

Bye, Patrick

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