linux-kernel - Re: [PATCH 5/6] staging: rtl8188eu: stop using DBG

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Date:	Sat, 18 Jul 2015 10:16:08 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jakub Sitnicki <jsitnicki@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 5/6] staging: rtl8188eu: stop using DBG_88E

On Fri, Jul 17, 2015 at 05:33:55PM +0200, Jakub Sitnicki wrote:
> On Thu, Jul 16, 2015 at 01:28 PM CEST, Sudip Mukherjee <sudipm.mukherjee@...il.com> wrote:
> > Stop using DBG_88E which is a custom macro for printing debugging
> > messages. Instead start using pr_debug and in the process define
> > pr_fmt.
> 
> In the end, don't we want to use netdev_dbg() everywhere where we work
> with a struct net_device? And use dev_dbg() everywhere where we work
> with a struct device (or a struct usb_interface)?
Looks like in some places we can get net_device from usb_interface.

struct dvobj_priv *dvobj = usb_get_intfdata(pusb_intf);
struct adapter *padapter = dvobj->if1;
struct net_device *pnetdev = padapter->pnetdev;
> 
> At least that's how I understand commit 8f26b8376faa ("checkpatch:
> update suggested printk conversions") description:
> 
>     Direct conversion of printk(KERN_<LEVEL>...  to pr_<level> isn't the
>     preferred conversion when a struct net_device or struct device is
>     available.
> 
> Do you think it is worth going straight for netdev_dbg()/dev_dbg() to
> avoid redoing it later?
At the end it should be netdev_* or dev_* and if both are not available
then pr_*. Here my main intention was to remove the custom defined
macro. And while doing this it is easier to use a script to reduce the
chances of error. Now that the custom macro is out of the way we can
concentrate on converting it to netdev_* or dev_*.
> 
> >
<snip>
> >  
> > +#define pr_fmt(fmt) "R8188EU: " fmt
> >  #include <osdep_service.h>
> >  #include <drv_types.h>
> >  #include <recv_osdep.h>
> 
> If we're going to stay with pr_debug(), using KBUILD_MODNAME seems to be
> the convention among drivers when defining pr_fmt():
> 
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
yes, KBUILD_MODNAME is the usual convention but you will also find many
places where that has not been used. Here I have used R8188EU to keep it
same for all the messages that will be printed from the other files of
this driver else it might be confusing for the user.

regards
sudip
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