linux-kernel - Re: [PATCH] staging: comedi: change some printk calls to pr

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Message-ID: <20141201084735.GA2705@hudson.localdomain>
Date:	Mon, 1 Dec 2014 00:47:35 -0800
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Chase Southwood <chase.southwood@...il.com>
Cc:	gregkh@...uxfoundation.org, abbotti@....co.uk,
	hsweeten@...ionengravers.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: change some printk calls to pr_err

Chase,

On Sun, Nov 30, 2014 at 11:05:56PM -0600, Chase Southwood wrote:
> There are a handful of calls to printk in ni_stc.h without specified log
> levels, as well as one in ni_mio_common.c.  This patch converts these
> calls to pr_err() instead, so that they are now explicitly log level
> ERR.
> 
> Signed-off-by: Chase Southwood <chase.southwood@...il.com>
> ---
> I tacked the change to ni_mio_common.c on to this patch since it's the same
> exact change and it's just one line, so I think a single patch is justified
> here.
>  drivers/staging/comedi/drivers/ni_mio_common.c |  2 +-
>  drivers/staging/comedi/drivers/ni_stc.h        | 14 +++++++-------
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
> index 353c17b..11e7017 100644
> --- a/drivers/staging/comedi/drivers/ni_mio_common.c
> +++ b/drivers/staging/comedi/drivers/ni_mio_common.c
> @@ -3945,7 +3945,7 @@ static unsigned ni_gpct_to_stc_register(enum ni_gpct_register reg)
>  		stc_register = Interrupt_B_Enable_Register;
>  		break;
>  	default:
> -		printk("%s: unhandled register 0x%x in switch.\n",
> +		pr_err("%s: unhandled register 0x%x in switch.\n",
>  		       __func__, reg);
>  		BUG();
>  		return 0;
[...]

On my system the default log level is 4 which corresponds to
KERN_WARNING.  So switching to pr_err() would change the log level
of these messages.  Using pr_warn() might be a better choice.

-- 
- Jeremiah Mahler
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