linux-kernel - Re: [PATCH v4 1/4] staging: mt7621-mmc: Fix debug macro N

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Date:   Wed, 22 Aug 2018 14:38:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Nishad Kamdar <nishadkamdar@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        NeilBrown <neil@...wn.name>, Joe Perches <joe@...ches.com>,
        Christian Lütke-Stetzkamp <christian@...mp.de>,
        John Crispin <blogic@...nwrt.org>
Subject: Re: [PATCH v4 1/4] staging: mt7621-mmc: Fix debug macro N_MSG

On Wed, Aug 22, 2018 at 04:40:56PM +0530, Nishad Kamdar wrote:
> On Wed, Aug 22, 2018 at 12:09:36PM +0300, Dan Carpenter wrote:
> > On Wed, Aug 22, 2018 at 02:04:55PM +0530, Nishad Kamdar wrote:
> > > This patch fixes the debug macro N_MSG. Replaces printk with
> > > dev_<level> without __func__ or __LINE__ or current->comm and
> > > current->pid. Removes the do {} while(0) loop for the single
> > > statement macro. Issue found by checkpatch.
> > > 
> > > Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> > > ---
> > >  drivers/staging/mt7621-mmc/dbg.h | 11 ++++-------
> > >  1 file changed, 4 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/drivers/staging/mt7621-mmc/dbg.h b/drivers/staging/mt7621-mmc/dbg.h
> > > index 2f2c56b73987..c56fb896617a 100644
> > > --- a/drivers/staging/mt7621-mmc/dbg.h
> > > +++ b/drivers/staging/mt7621-mmc/dbg.h
> > > @@ -104,13 +104,10 @@ do { \
> > >  
> > >  #define N_MSG(evt, fmt, args...)
> > >  /*
> > > -do {    \
> > > -    if ((DBG_EVT_##evt) & sd_debug_zone[host->id]) { \
> > > -        printk(KERN_ERR TAG"%d -> "fmt" <- %s() : L<%d> PID<%s><0x%x>\n", \
> > > -            host->id,  ##args , __FUNCTION__, __LINE__, current->comm, current->pid);	\
> > > -    } \
> > > -} while(0)
> > > -*/
> > > + *if ((DBG_EVT_##evt) & sd_debug_zone[host->id]) { \
> > > + *    dev_err(mmc_dev(host->mmc), "%d -> " fmt "\n", host->id, ##args) \
> > > + *}
> > > + */
> > 
> > I don't understand what you're trying to do here.  You just commented
> > out the macro and turned it into a no-op.  That's not what the patch
> > description says.
> > 
> > To me the original code seems fine.
> > 
> > regards,
> > dan carpenter
> >
> 
> Ok. But the macro definition was already commented.
> I just changed printk to dev_err and gave it a better
> block comment format.
> Should I leave the older version as it is ?

Oh...  Yeah.  You're right.  Sorry about that.

We normally just delete dead code without even thinking hard about it.
It turns out that if we delete all the N_MSG() code, it's actually quite
a bit.  But probably it's the right thing to do, instead of hanging on
to it like a hoarder.

regards,
dan carpenter