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

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Message-Id: <20080218.164305.67586867.davem@davemloft.net>
Date:	Mon, 18 Feb 2008 16:43:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.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

From: Patrick McHardy <kaber@...sh.net>
Date: Mon, 18 Feb 2008 22:17:27 +0100

> The way pr_debug is implemented it still results in two function
> calls per packet since the compiler doesn't know that it doesn't
> have visible side-effects besides modifying the (unused) buffer.
> I confirmed this using codiff.

That's a bug.

I think we can fix this easily by using __attribute_const_
on the print_mac() declaration.  Let me play with that.
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