linux-kernel - Re: [PATCH] stmmac ethernet: remove cut & paste code

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Message-ID: <20161128143539.GB31224@amd>
Date:   Mon, 28 Nov 2016 15:35:39 +0100
From:   Pavel Machek <pavel@....cz>
To:     Joe Perches <joe@...ches.com>
Cc:     peppe.cavallaro@...com, netdev@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        ezequiel@...guardiasur.com.ar, sonic.zhang@...log.com,
        fabrice.gasnier@...com
Subject: Re: [PATCH] stmmac ethernet: remove cut & paste code

On Mon 2016-11-28 06:24:28, Joe Perches wrote:
> On Mon, 2016-11-28 at 12:50 +0100, Pavel Machek wrote:
> > On Thu 2016-11-24 14:27:13, Joe Perches wrote:
> > > On Thu, 2016-11-24 at 22:44 +0100, Pavel Machek wrote:
> > > > On Thu 2016-11-24 12:05:25, Joe Perches wrote:
> > > > > On Thu, 2016-11-24 at 12:05 +0100, Pavel Machek wrote:
> > > > > > Remove duplicate code from _tx routines.
> > > > > 
> > > > > trivia:
> > > > > 
> > > > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > > > 
> > > > > []
> > > > > > @@ -1960,6 +1960,38 @@ static void stmmac_tso_allocator(struct stmmac_priv *priv, unsigned int des,
> > > > > >  	}
> > > > > >  }
> > > > > >  
> > > > > > +static void stmmac_xmit_common(struct sk_buff *skb, struct net_device *dev, int nfrags, struct dma_desc *desc)
> > > > > > +{
> > > > > > +	struct stmmac_priv *priv = netdev_priv(dev);
> > > > > > +
> > > > > > +	if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
> > > > > > +		if (netif_msg_hw(priv))
> > > > > > +			pr_debug("%s: stop transmitted packets\n", __func__);
> > > > > 
> > > > > 		netif_dbg(priv, hw, dev, "%s: stop transmitted packets\n",
> > > > > 			  __func__);
> > > > 
> > > > Not now. Modifying the code while de-duplicating would be bad idea.
> > > 
> > > Too many people think overly granular patches are the
> > > best and only way to make changes.
> > > Deduplication and consolidation can happen simultaneously.
> > 
> > Can, but should not at this point. Please take a look at the driver in
> > question before commenting on trivial printk style.
> 
> I had.
> 
> It's perfectly acceptable and already uses netif_<level> properly.
> 
> This consolidation now introduces the _only_ instance where it is
> now improperly using a netif_msg_<type> then single pr_<level>
> function sequence that should be consolidated into netif_dbg.

> Every other use of netif_msg_<level> then either emits multiple
> lines or is used in an if/else.

Are you looking at right driver? I don't see single use of
netif_msg_<level>, but see this at stmmac_main.c:756. Code is actually
pretty consistent using pr_*.

                                if (netif_msg_link(priv))
                                        pr_warn("%s: Speed (%d) not 10/100\n",
                                                dev->name, phydev->speed);

Anyway, I'm moving code around, if you want to do trivial cleanups, do
them yourself.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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