netdev - Re: [RFD] L2 Network namespace infrastructure

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Date:	Sat, 23 Jun 2007 22:45:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	kaber@...sh.net, netdev@...r.kernel.org, hadi@...erus.ca,
	shemminger@...ux-foundation.org, greearb@...delatech.com,
	jeff@...zik.org, yoshfuji@...ux-ipv6.org, containers@...ts.osdl.org
Subject: Re: [RFD] L2 Network namespace infrastructure

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Sat, 23 Jun 2007 15:41:16 -0600

> If you want the argument to compile out.  That is not a problem at all.
> I dropped that part from my patch because it makes infrastructure more
> complicated and there appeared to be no gain.  However having a type
> that you can pass that the compiler can optimize away is not a
> problem.  Basically you just make the argument:
> 
> typedef struct {} you_can_compile_me_out;  /* when you don't want it. */
> typedef void * you_can_compile_me_out;     /* when you do want it. */
> 
> And gcc will generate no code to pass the argument when you compile
> it out.

I don't want to have to see or be aware of the types or the
fact that we support namespaces when I work on the networking
code.

This is why I like the security layer in the kernel we have,
I can disable it and it's completely not there.  And I can
be completely ignorant of it's existence when I work on the
networking stack.
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