netdev - Re: [PATCH] net/8021q/vlan_dev.c

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Message-ID: <47BAC206.5070304@trash.net>
Date:	Tue, 19 Feb 2008 12:48:22 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
CC:	joe@...ches.com, bruno@...nktube.com, netdev@...r.kernel.org,
	jgarzik@...ox.com, linux-wireless@...r.kernel.org,
	linville@...driver.com
Subject: Re: [PATCH] net/8021q/vlan_dev.c - Use print_mac

David Miller wrote:
> From: David Miller <davem@...emloft.net>
> Date: Mon, 18 Feb 2008 16:43:05 -0800 (PST)
> 
>> I think we can fix this easily by using __attribute_const_
>> on the print_mac() declaration.  Let me play with that.
> 
> Actually it seems the 'pure' attribute is more important
> here.  Although it's not semantically a perfect match,
> what we need to tell the compiler is basically that:
> 
> 1) the return value depends upon the inputs
> 2) if the input is not used, it's safe to avoid the call
> 
> and 'pure' accomplishes that without any unwanted side-effects.
> 
> I think this will not result in any unwanted over-optimization.
> Because if the inputs change in any way GCC has to emit the
> call.
> 
> Any objections?


This seems fine to me, thanks Dave.
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