linux-kernel - Re: [PATCH] staging: mt7621-mmc: Remove do {} while (0) loop for single statement macro

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Date:   Sun, 23 Sep 2018 15:04:12 +0530
From:   Nishad Kamdar <nishadkamdar@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Joe Perches <joe@...ches.com>, NeilBrown <neil@...wn.name>,
        devel@...verdev.osuosl.org,
        Christian Lütke-Stetzkamp <christian@...mp.de>,
        linux-kernel@...r.kernel.org, John Crispin <blogic@...nwrt.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] staging: mt7621-mmc: Remove do {} while (0) loop for
 single statement macro

On Tue, Sep 18, 2018 at 01:27:11PM +0200, Greg Kroah-Hartman wrote:
> On Sat, Sep 15, 2018 at 06:47:51PM +0530, Nishad Kamdar wrote:
> > This patch removes do {} while (0) loop for single statement macros.
> > Issue found by checkpatch.
> > 
> > Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> > ---
> >  drivers/staging/mt7621-mmc/sd.c | 28 +++++++---------------------
> >  1 file changed, 7 insertions(+), 21 deletions(-)
> > 
> > diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c
> > index 7474f9ed7b5b..ec12a3a5a926 100644
> > --- a/drivers/staging/mt7621-mmc/sd.c
> > +++ b/drivers/staging/mt7621-mmc/sd.c
> > @@ -104,14 +104,10 @@ static int cd_active_low = 1;
> >  /* gate means clock power down */
> >  static int g_clk_gate = 0;
> >  #define msdc_gate_clock(id) \
> > -	do {					       \
> > -		g_clk_gate &= ~(1 << ((id) + PERI_MSDC0_PDN));	\
> > -	} while (0)
> > +	(g_clk_gate &= ~(1 << ((id) + PERI_MSDC0_PDN)))
> 
> This should become an inline function, right?
> 
> 
> >  /* not like power down register. 1 means clock on. */
> >  #define msdc_ungate_clock(id) \
> > -	do {					    \
> > -		g_clk_gate |= 1 << ((id) + PERI_MSDC0_PDN);	\
> > -	} while (0)
> > +	(g_clk_gate |= 1 << ((id) + PERI_MSDC0_PDN))
> 
> Same here.
> 
> >  
> >  // do we need sync object or not
> >  void msdc_clk_status(int *status)
> > @@ -170,9 +166,7 @@ static void msdc_clr_fifo(struct msdc_host *host)
> >  	} while (0)
> >  
> >  #define msdc_irq_restore(val) \
> > -	do {					\
> > -		sdr_set_bits(host->base + MSDC_INTEN, val);	\
> > -	} while (0)
> > +	(sdr_set_bits(host->base + MSDC_INTEN, val))
> 
> Just call the one function where this is used and delete this #define.
> 
> Same type of changes for the rest of these as well.
> 
> thanks,
> 
> greg k-h

Ok. I'll do that.

Thanks for the review.

regards,
nishad