linux-kernel - Re: [alsa-devel] [PATCH v2 2/2] ALSA: au88x0: pr_* replaced with dev

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Message-ID: <20141011113349.GA9962@sudip-PC>
Date:	Sat, 11 Oct 2014 17:03:49 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Joe Perches <joe@...ches.com>, h@...ip-PC
Cc:	Raymond Yau <superquad.vortex2@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH v2 2/2] ALSA: au88x0: pr_* replaced with
 dev_*

On Sat, Oct 11, 2014 at 03:48:11AM -0700, Joe Perches wrote:
> On Sat, 2014-10-11 at 14:39 +0530, Sudip Mukherjee wrote:
> > On Sat, Oct 11, 2014 at 03:20:56PM +0800, Raymond Yau wrote:
> > > >
<snip>
> > > > ---
> > > >
> > > 
> > > >  static int vortex_core_init(vortex_t *vortex)
> > > >  {
> > > >
> > > > -       pr_info( "Vortex: init.... ");
> > > > +       dev_info(vortex->card->dev, "init.... ");
> > > 
> > > Is it possible to add linefeed  since "done/n" won't appear in the same
> > > line with init nor shutdown?
> > > 
> > should we add linefeed ?
> > as of now it will print init.... then it will print done as the init is complete.
> > so dmesg will show us:
> > 
> > init....done.
> > 
> > same for shutdown.
> > but if we give linefeed , then it will become : 
> > 
> > init....
> > done.
> > 
> > the meaning will be lost. and many user might just wonder what is done ? 
> []
> > > > @@ -2738,7 +2744,7 @@ static int vortex_core_init(vortex_t *vortex)
> > > >  static int vortex_core_shutdown(vortex_t * vortex)
> > > >  {
> > > >
> > > > -       pr_info( "Vortex: shutdown...");
> > > > +       dev_info(vortex->card->dev, "shutdown...");
> > > >  #ifndef CHIP_AU8820
> > > >         vortex_eq_free(vortex);
> > > >         vortex_Vort3D_disable(vortex);
> > > > @@ -2760,7 +2766,7 @@ static int vortex_core_shutdown(vortex_t * vortex)
> > > >         msleep(5);
> > > >         hwwrite(vortex->mmio, VORTEX_IRQ_SOURCE, 0xffff);
> > > >
> > > > -       pr_info( "done.\n");
> > > > +       dev_info(vortex->card->dev, "done.\n");
> > > >         return 0;
> > > >  }
> 
> It's actually on 2 lines before your patch.
> 
> 	pr_info("a");
> 	pr_info("b\n");
> 
> already emits 2 separate lines.
> 
> 	pr_info("a");
> 	pr_cont("b\n");
> 
> emits a single line "ab"
> (unless some other thread emits something in-between)
> 
> pr_cont or a bare printk can be used after a dev_info
> without a newline to avoid unwanted newlines.

i think i was not thinking while writing the previous mail.
pr_info("a");
pr_info("b\n");
should print as "ab" , considering no other threads prints in between.
but after converting it to dev_info it will become :
"dev: adev: b".
and for our "init.... done" , it will become 
"au88x0: init.... au88x0: done."  ( i have ommited the driver name)

can't we do some thing like :
dev_info(vortex->card->dev, "init.... started\n");
dev_info(vortex->card->dev, "init....done\n");
then even if some other thread prints , then we will not loose the reference.

thanks
sudip
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