netdev - Re: [PATCH 3/4 - rev 2] Initilize and populate age field

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Message-ID: <20070821112735.GO32236@postel.suug.ch>
Date:	Tue, 21 Aug 2007 13:27:35 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Varun Chandramohan <varunc@...ux.vnet.ibm.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, kaber@...sh.net,
	socketcan@...tkopp.net, shemminger@...ux-foundation.org,
	krkumar2@...ibm.com, varuncha@...ibm.com
Subject: Re: [PATCH 3/4 - rev 2] Initilize and populate age field

* Varun Chandramohan <varunc@...ux.vnet.ibm.com> 2007-08-21 16:52
> I know its a bit confusing but let me explain the reason. In my first
> version patch i used fn_hash_insert() (place where alias is created)as
> place to insert my current time in the age field.
> This will eventually call fib_dump_info() for inserting the age filed
> attribute into the skb. Now in both places i have to call
> do_gettimeofday(). Its obvious that i need it in fn_hash_insert(), its
> also need in fib_dump_info() as it is the same function called for
> retrieving and dumping the age value to the userspace. So as you are
> aware that before we dump it to userspace we need to subtract the value
> with current time i need to call do_gettimeofday() twice. To avoid this
> i did as above.

At least put a comment there, it's far from obvious.
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