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

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Message-ID: <547C3B9D.7080002@mev.co.uk>
Date:	Mon, 01 Dec 2014 09:57:49 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Jeremiah Mahler <jmmahler@...il.com>,
	Chase Southwood <chase.southwood@...il.com>,
	gregkh@...uxfoundation.org, hsweeten@...ionengravers.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: change some printk calls to pr_err

On 01/12/14 08:47, Jeremiah Mahler wrote:
> 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.

I wouldn't worry about the log level in this case as those printks would 
only be reached due to driver bugs.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-
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