linux-kernel - Re: [PATCH] net/packet: remove dead code and unneeded variable from prb_setup_retire_blk

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Message-ID: <alpine.LNX.2.00.1111150034120.9919@swampdragon.chaosbits.net>
Date:	Tue, 15 Nov 2011 00:37:33 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Ryan Mallon <rmallon@...il.com>,
	"David S. Miller" <davem@...emloft.net>
cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>,
	Ben Greear <greearb@...delatech.com>,
	Chetan Loke <loke.chetan@...il.com>,
	waltje@...lt.NL.Mugnet.ORG, gw4pts@...pts.ampr.org,
	waltje@...ux.com, ross.biro@...il.com, alan@...ux.intel.com
Subject: Re: [PATCH] net/packet: remove dead code and unneeded variable from
 prb_setup_retire_blk_timer()

On Mon, 14 Nov 2011, Ryan Mallon wrote:

> On 14/11/11 08:55, Jesper Juhl wrote:
> 
> > We test for 'tx_ring' being != zero and BUG() if that's the case. So after
> > that check there is no way that 'tx_ring' could be anything _but_ zero, so
> > testing it again is just dead code. Once that dead code is removed, the
> > 'pkc' local variable becomes entirely redundant, so remove that as well.
> 
> 
> What if CONFIG_BUG=n?
> 

Arrgh, I didn't consider that (should have, but didn't).. In that case 
we'll have 
#define BUG() do {} while(0)
which is not going to work all that peachy with my change...

David: You may want to pass on this one. I obviously didn't think it 
through properly - sorry :-(

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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