linux-kernel - Re: [PATCH] new UDPCP Communication Protocol

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Message-ID: <1294006914.5675.14.camel@wall-e>
Date:	Sun, 02 Jan 2011 23:21:54 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	davem@...emloft.net, netdev@...r.kernel.org,
	eric.dumazet@...il.com, shemminger@...tta.com
Subject: Re: [PATCH] new UDPCP Communication Protocol

Am Sonntag, den 02.01.2011, 23:04 +0100 schrieb Jesper Juhl:
> On Sun, 2 Jan 2011, Stefani Seibold wrote:
> 
> > Am Sonntag, den 02.01.2011, 20:55 +0100 schrieb Jesper Juhl:
> > > On Sun, 2 Jan 2011, stefani@...bold.net wrote:
> > 
> > 
> > > > +
> > > > +#define VERSION	"0.71"
> > > 
> > > I personally don't think this makes much sense.
> > > Version numbers for individual modules tend to not get updated as the code 
> > > changes over the years, which make them rather meaningless.
> > > Since this module depends on functionallity of the kernel which it is 
> > > compiled with, the actual (meaningful) version of this code is that of the 
> > > kernel tree being compiled that includes this code. Which again makes this 
> > > specific version define meaningless.
> > > 
> > > So, why not save a few lines of code and get rid of this rather pointless 
> > > thing?
> > > 
> > 
> > I like it, it gives me a better monitoring during development which
> > version is currently tested.
> > 
> Does it really?  If your code is merged, then it's probably going to be
> changed by various people over the years and not all of them (most) are
> not going to notice nor change the version number, nor is the version
> number here going to be changed when other parts of the kernel (that you
> depend upon) are changed. So when you get a bug report in the future
> mentioning VERSION xxx.yyy.zzz of your module it's not going to tell you
> anything. What you want to know is the version of the kernel proper (or
> git head commit id) - the VERSION defined here is likely going to be next
> to useless in 1+ years (or less), so why have it at all?
> 

I said currently, so i agree but not yet. Okay?

> 
> > > [...]
> > > > +static struct udpcp_dest *find_dest(struct sock *sk, __be32 addr, __be16 port)
> > > > +{
> > > > +	struct udpcp_dest *dest;
> > > > +
> > > > +	dest = __find_dest(sk, addr, port);
> > > 
> > > Why not
> > > 
> > > static struct udpcp_dest *find_dest(struct sock *sk, __be32 addr, __be16 port)
> > > {
> > >      struct udpcp_dest *dest =  __find_dest(sk, addr, port);
> > > 
> > > ?
> > I will fix it but i think this is counting peas.
> >  
> Sure, it's a tiny trivial thing. I just took the time to actually read
> through your patch and then I commented on everything I spotted.
> 
> 
> > > [...]
> > > > +static void udpcp_flush_err(struct sock *sk, struct udpcp_dest *dest)
> > > > +{
> > > > +	struct inet_sock *inet = inet_sk(sk);
> > > > +	struct udpcp_sock *usk = udpcp_sk(sk);
> > > > +
> > > > +	if (!inet->recverr)
> > > > +		skb_queue_purge(&dest->xmit);
> > > > +	else {
> > > 
> > > CodingStyle would want this as
> > > 
> > >      if (!inet->recverr) {
> > >              skb_queue_purge(&dest->xmit);
> > >      } else {
> > > 
> > > If one branch needs {} then both should get them.
> > > 
> > ./scripts/checkpatch.pl did not complain about this, so i think it is
> > okay.
> > 
> scripts/checkpatch.pl is not the final judge on style issues - not by a 
> long shot. In any case, if you read Documentation/CodingStyle you'll 
> notice this : 
> 
> "
> Do not unnecessarily use braces where a single statement will do.
> 
> if (condition)
>         action();
> 
> This does not apply if one branch of a conditional statement is a single
> statement. Use braces in both branches.
> 
> if (condition) {
>         do_this();
>         do_that();
> } else {
>         otherwise();
> }
> "
> 
I will fix it but i think this is coding style from hell :-)



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