netdev - Re: [PATCH 2/3][NET] gen_estimator: list_empty() check in est

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Date:	Mon, 21 Jan 2008 07:34:55 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Badalian Vyacheslav <slavon@...telecom.ru>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/3][NET] gen_estimator: list_empty() check in
	est_timer() fixed

On Sun, Jan 20, 2008 at 03:55:44PM -0800, Stephen Hemminger wrote:
> On Mon, 21 Jan 2008 00:49:59 +0100
> Jarek Poplawski <jarkao2@...il.com> wrote:
> 
> > This patch changes the method of checking for empty list in est_timer():
> > list_empty() is not recommended for RCU protected lists. Now, it's simply
> > a variable used for this.
> > 
> > Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
> > 
> > ---
> > 
> > diff -Nurp 2.6.24-rc8-mm1-p1-/net/core/gen_estimator.c 2.6.24-rc8-mm1-p1+/net/core/gen_estimator.c
> > --- 2.6.24-rc8-mm1-p1-/net/core/gen_estimator.c	2008-01-20 20:58:35.000000000 +0100
> > +++ 2.6.24-rc8-mm1-p1+/net/core/gen_estimator.c	2008-01-20 21:07:42.000000000 +0100
> > @@ -106,6 +106,7 @@ static void est_timer(unsigned long arg)
> >  {
> >  	int idx = (int)arg;
> >  	struct gen_estimator *e;
> > +	int list_not_empty = 0;
> 
> Using a negative name for what is a boolean value leads
> to code that reads like a double negative sentence. Better to choose
> a variable name that is direct, can't use list_empty because that
> is a macro, so how about "estimator_found".
> 

Hmm, seems right, but since just after sending this patch I started
to doubt this 2/3 patch could really matter here, I'll maybe wait with
this name change for some confirmation yet.

So, since it certainly doesn't matter for 1/3 and 3/3 I withdraw this
2/3 patch for now.

BTW, I've forgotten to mention with patch 1/3 that this checking with
warning on gen_new_estimator() double call should be only temporary,
and after more testing gen_estimator structure could be probably
decreased after removing bstats and rate_est fields.

Thanks,
Jarek P.
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