netdev - Re: [PATCH net-next] core: remove old parameter for __dst_destroy_metrics

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Message-Id: <20131227.120820.827902523607182899.davem@davemloft.net>
Date:	Fri, 27 Dec 2013 12:08:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	roy.qing.li@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] core: remove old parameter for
 __dst_destroy_metrics_generic

From: roy.qing.li@...il.com
Date: Fri, 27 Dec 2013 17:26:45 +0800

> From: Li RongQing <roy.qing.li@...il.com>
> 
> when call __dst_destroy_metrics_generic, we always know who old is, so
> do not need to pass it.
> 
> Signed-off-by: Li RongQing <roy.qing.li@...il.com>

It's a parameter so that we pass it in a register, rather than having the
caller and the function both have to perform a memory operation and load
the value.

It's an optimization.

I'm not applying this, sorry.
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