linux-kernel - Re: [PATCH 02/49] staging: rtl8723bs: replace DBG_871X_SEL log macro with netdev

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Message-ID: <20210428092842.GQ1981@kadam>
Date:   Wed, 28 Apr 2021 12:28:42 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Fabio Aiuto <fabioaiuto83@...il.com>
Cc:     Joe Perches <joe@...ches.com>, gregkh@...uxfoundation.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/49] staging: rtl8723bs: replace DBG_871X_SEL log macro
 with netdev_dbg()

On Fri, Apr 23, 2021 at 06:52:49PM +0200, Fabio Aiuto wrote:
> On Fri, Apr 23, 2021 at 08:27:58AM -0700, Joe Perches wrote:
> > On Fri, 2021-04-23 at 16:57 +0200, Fabio Aiuto wrote:
> > > replace DBG_871X_SEL log macro with the net device driver
> > > recommended netdev_dbg().
> > > 
> > > This macro by default does a raw printk, and the alternative
> > > behaviour, never triggered is a seq_print() call.
> > []
> > > diff --git a/drivers/staging/rtl8723bs/core/rtw_debug.c b/drivers/staging/rtl8723bs/core/rtw_debug.c
> > []
> > > @@ -23,9 +23,10 @@ void mac_reg_dump(void *sel, struct adapter *adapter)
> > >  	for (i = 0x0; i < 0x800; i += 4) {
> > >  		if (j%4 == 1)
> > >  			netdev_dbg(adapter->pnetdev, "0x%03x", i);
> > > -		DBG_871X_SEL(sel, " 0x%08x ", rtw_read32(adapter, i));
> > > +		netdev_dbg(adapter->pnetdev, " 0x%08x ",
> > > +			   rtw_read32(adapter, i));
> > >  		if ((j++)%4 == 0)
> > > -			DBG_871X_SEL(sel, "\n");
> > > +			netdev_dbg(adapter->pnetdev, "\n");
> > >  	}
> > 
> > This makes a mess of the output as each netdev_dbg call
> > is a separate line.
> > 
> > Dumping 1000 register lines into output logs seems impolite
> > at best, even for debugging.
> > 
> > This _might_ be rewritten to something like:
> > 
> > void dump_4_regs(struct adapter *adapter, int offset)
> > {
> > 	u32 reg[4];
> > 	int i;
> > 
> > 	for (i = 0; i < 4; i++)
> > 		reg[i] = rtw_read32(adapter, offset + i);
> > 
> > 	netdev_dbg(adapter->pnetdev, "0x%03x 0x%08x 0x%08x 0x%08x 0x%08x\n",
> > 		   i, reg[0], reg[1], reg[2], reg[3]);
> > }
> > 
> > void mac_reg_dump(...)
> > {
> > 	...
> > 
> > 	for (i = 0; i < 0x800; i += 4)
> > 		dump_4_regs(adapter, i);
> > 
> > 
> > 
> 
> interesting, sure that will be matter of another patch series,
> the ugly output was already there, old macro used to wrap a raw
> printk...

The raw printk doesn't automatically add a new line at the end but a
netdev_dbg() does.  (You're still supposed to add a manual \n to those
but if you don't the lower layers will do it automatically.)

regards,
dan carpenter