netdev - Re: [PATCH net-next 2/2] bonding: combine netlink and console error messages

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Date:   Sun, 08 Aug 2021 03:02:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jonathan Toppins <jtoppins@...hat.com>, netdev@...r.kernel.org
Cc:     Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] bonding: combine netlink and console error
 messages

On Sat, 2021-08-07 at 17:54 -0400, Jonathan Toppins wrote:
> On 8/6/21 11:52 PM, Joe Perches wrote:
> > On Fri, 2021-08-06 at 23:30 -0400, Jonathan Toppins wrote:
> > > There seems to be no reason to have different error messages between
> > > netlink and printk. It also cleans up the function slightly.
> > []
> > > diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> > []
> > > +#define BOND_NL_ERR(bond_dev, extack, errmsg) do {		\
> > > +	NL_SET_ERR_MSG(extack, errmsg);				\
> > > +	netdev_err(bond_dev, "Error: " errmsg "\n");		\
> > > +} while (0)
> > > +
> > > +#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {	\
> > > +	NL_SET_ERR_MSG(extack, errmsg);				\
> > > +	slave_err(bond_dev, slave_dev, "Error: " errmsg "\n");	\
> > > +} while (0)
> > 
> > If you are doing this, it's probably smaller object code to use
> > 	"%s", errmsg
> > as the errmsg string can be reused
> > 
> > #define BOND_NL_ERR(bond_dev, extack, errmsg)			\
> > do {								\
> > 	NL_SET_ERR_MSG(extack, errmsg);				\
> > 	netdev_err(bond_dev, "Error: %s\n", errmsg);		\
> > } while (0)
> > 
> > #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg)	\
> > do {								\
> > 	NL_SET_ERR_MSG(extack, errmsg);				\
> > 	slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg);	\
> > } while (0)
> > 
> > 
> 
> I like the thought and would agree if not for how NL_SET_ERR_MSG is 
> coded. Unfortunately it does not appear as though doing the above change 
> actually generates smaller object code. Maybe I have incorrectly 
> interpreted something?

No, it's because you are compiling allyesconfig or equivalent.
Try defconfig with bonding.