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Date:   Tue, 20 Feb 2018 18:16:47 +0100
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Shreeya Patel <shreeya.patel23498@gmail.com>
Cc:     boris.brezillon@free-electrons.com, richard@nod.at,
        dwmw2@infradead.org, computersforpeace@gmail.com,
        marek.vasut@gmail.com, cyrille.pitchen@wedev4u.fr,
        maximlevitsky@gmail.com, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org, ezequiel@vanguardiasur.com.ar,
        outreachy-kernel@googlegroups.com
Subject: Re: [PATCH NAND v2] mtd: nand: Replace printk() with appropriate
 pr_*macro()
Message-ID: <20180220181647.6f2367b6@bbrezillon>
In-Reply-To: <1519146401.12276.4.camel@gmail.com>
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        <20180219155115.3d9d1bd5@bbrezillon>
        <1519146401.12276.4.camel@gmail.com>
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On Tue, 20 Feb 2018 22:36:41 +0530
Shreeya Patel <shreeya.patel23498@gmail.com> wrote:

> On Mon, 2018-02-19 at 15:51 +0100, Boris Brezillon wrote:
> > Hi Shreeya,
> > 
> > On Mon, 19 Feb 2018 18:43:45 +0530
> > Shreeya Patel <shreeya.patel23498@gmail.com> wrote:
> >   
> > > 
> > > The log levels embedded with the name are more concise than
> > > printk.
> > > Replace printks having a log level with the appropriate
> > > pr_*macro.
> > > 
> > > Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>
> > > ---
> > > 
> > > Changes in v2:
> > >   -Merge previous patches of the patchset regarding replacement
> > > of printk with pr_*macro, into single patch.
> > > 
> > > 
> > >  drivers/mtd/nand/cs553x_nand.c   |  9 ++---
> > >  drivers/mtd/nand/diskonchip.c    | 76 +++++++++++++++++++++-------
> > > ------------
> > >  drivers/mtd/nand/fsl_elbc_nand.c |  2 +-
> > >  drivers/mtd/nand/fsl_ifc_nand.c  |  2 +-
> > >  drivers/mtd/nand/mxc_nand.c      |  2 +-
> > >  drivers/mtd/nand/nand_bch.c      | 12 +++----
> > >  drivers/mtd/nand/nandsim.c       | 10 +++---
> > >  drivers/mtd/nand/r852.c          |  2 +-
> > >  drivers/mtd/nand/r852.h          |  6 ++--
> > >  drivers/mtd/nand/sm_common.c     |  5 ++-
> > >  10 files changed, 65 insertions(+), 61 deletions(-)
> > >   
> > [...]
> >   
> > > 
> > >  
> > > diff --git a/drivers/mtd/nand/diskonchip.c
> > > b/drivers/mtd/nand/diskonchip.c
> > > index c3aa53c..b97d88c 100644
> > > --- a/drivers/mtd/nand/diskonchip.c
> > > +++ b/drivers/mtd/nand/diskonchip.c  
> > [...]
> >   
> > > 
> > > @@ -438,7 +438,7 @@ static void __init doc2000_count_chips(struct
> > > mtd_info *mtd)
> > >  			break;
> > >  	}
> > >  	doc->chips_per_floor = i;
> > > -	printk(KERN_DEBUG "Detected %d chips per floor.\n", i);
> > > +	pr_info("Detected %d chips per floor.\n", i);  
> > Should be pr_debug() here.
> >   
> > > 
> > >  }
> > >    
> > [...]
> >   
> > > 
> > > diff --git a/drivers/mtd/nand/nandsim.c
> > > b/drivers/mtd/nand/nandsim.c
> > > index 246b439..4e5f817 100644
> > > --- a/drivers/mtd/nand/nandsim.c
> > > +++ b/drivers/mtd/nand/nandsim.c
> > > @@ -184,15 +184,15 @@ MODULE_PARM_DESC(bch,		 "Enable
> > > BCH ecc and set how many bits should "
> > >  
> > >  /* Simulator's output macros (logging, debugging, warning, error)
> > > */
> > >  #define NS_LOG(args...) \
> > > -	do { if (log) printk(KERN_DEBUG NS_OUTPUT_PREFIX " log: "
> > > args); } while(0)
> > > +	do { if (log) pr_debug(NS_OUTPUT_PREFIX " log: " args); }
> > > while(0)  
> > You could define pr_fmt() to avoid passing NS_OUTPUT_PREFIX.
> > Something
> > like:
> > 
> > #define pr_fmt(fmt)	"[nandsim]" fmt
> > 
> > (remember to put this definition before include directives).
> > 
> > Then, all you have to do is
> > 
> > do { if (log) pr_debug(" log: " args); } while(0)
> >   
> > > 
> > >  #define NS_DBG(args...) \
> > > -	do { if (dbg) printk(KERN_DEBUG NS_OUTPUT_PREFIX " debug:
> > > " args); } while(0)
> > > +	do { if (dbg) pr_debug(NS_OUTPUT_PREFIX " debug: " args);
> > > } while(0)
> > >  #define NS_WARN(args...) \
> > > -	do { printk(KERN_WARNING NS_OUTPUT_PREFIX " warning: "
> > > args); } while(0)
> > > +	do { pr_warn(NS_OUTPUT_PREFIX " warning: " args); }
> > > while(0)
> > >  #define NS_ERR(args...) \
> > > -	do { printk(KERN_ERR NS_OUTPUT_PREFIX " error: " args); }
> > > while(0)
> > > +	do { pr_err(NS_OUTPUT_PREFIX " error: " args); } while(0)
> > >  #define NS_INFO(args...) \
> > > -	do { printk(KERN_INFO NS_OUTPUT_PREFIX " " args); }
> > > while(0)
> > > +	do { pr_info(NS_OUTPUT_PREFIX " " args); } while(0)
> > >  
> > >  /* Busy-wait delay macros (microseconds, milliseconds) */
> > >  #define NS_UDELAY(us) \
> > > diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
> > > index fc9287a..3d54c6a 100644
> > > --- a/drivers/mtd/nand/r852.c
> > > +++ b/drivers/mtd/nand/r852.c
> > > @@ -935,7 +935,7 @@ static int  r852_probe(struct pci_dev *pci_dev,
> > > const struct pci_device_id *id)
> > >  		&dev->card_detect_work, 0);
> > >  
> > >  
> > > -	printk(KERN_NOTICE DRV_NAME ": driver loaded
> > > successfully\n");
> > > +	pr_notice(DRV_NAME ": driver loaded successfully\n");  
> > Same here:
> > 
> > #define pr_fmt(fmt)	DRV_NAME fmt  
> 
> I am facing the following errors here.
> 
> 
> 
> In file included from drivers/mtd/nand/r852.c:22:0:
> drivers/mtd/nand/r852.h:148:0: warning: "pr_fmt" redefined
>  #define pr_fmt(fmt)  (DRV_NAME fmt)
>  ^
> In file included from ./include/linux/kernel.h:14:0,
>                  from drivers/mtd/nand/r852.c:10:
> ./include/linux/printk.h:287:0: note: this is the location of the
> previous definition
>  #define pr_fmt(fmt) fmt

That's because you didn't define pr_fmt() before all the #include
directives in this driver. See the '#indef pr_fmt' statement in printk.h
which is preventing redefinition of this symbol if the file including
printk.h (either directly or indirectly) already defines it.

-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com