linux-kernel - Re: [PATCH 1/3] apple_bl: Convert printks to pr

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Date:	Tue, 07 Feb 2012 08:47:11 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 1/3] apple_bl: Convert printks to pr_<level>

On 07/02/12 01:35, Seth Forshee wrote:

> On Mon, Feb 06, 2012 at 10:23:13AM +1100, Ryan Mallon wrote:
>> On 04/02/12 07:28, Seth Forshee wrote:
>>
>>> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
>>> ---
>>>  drivers/video/backlight/apple_bl.c |   29 ++++++++---------------------
>>>  1 files changed, 8 insertions(+), 21 deletions(-)
>>>
>>> diff --git a/drivers/video/backlight/apple_bl.c b/drivers/video/backlight/apple_bl.c
>>> index be98d15..66d5bec 100644
>>> --- a/drivers/video/backlight/apple_bl.c
>>> +++ b/drivers/video/backlight/apple_bl.c
>>> @@ -16,6 +16,8 @@
>>>   *  get at the firmware code in order to figure out what it's actually doing.
>>>   */
>>>  
>>> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>>> +
>>>  #include <linux/module.h>
>>>  #include <linux/kernel.h>
>>>  #include <linux/init.h>
>>> @@ -38,13 +40,6 @@ struct hw_data {
>>>  
>>>  static const struct hw_data *hw_data;
>>>  
>>> -#define DRIVER "apple_backlight: "
>>> -
>>> -/* Module parameters. */
>>> -static int debug;
>>> -module_param_named(debug, debug, int, 0644);
>>> -MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
>>
>>
>> Removal of this module parameter is not noted in the changelog.
>>
>>> -
>>>  /*
>>>   * Implementation for machines with Intel chipset.
>>>   */
>>> @@ -58,9 +53,7 @@ static int intel_chipset_send_intensity(struct backlight_device *bd)
>>>  {
>>>  	int intensity = bd->props.brightness;
>>>  
>>> -	if (debug)
>>> -		printk(KERN_DEBUG DRIVER "setting brightness to %d\n",
>>> -		       intensity);
>>> +	pr_debug("setting brightness to %d\n", intensity);
>>
>>
>> As Joe points out, this no longer has the same behaviour as it did
>> previously. The pr_debug will only show up if you have DEBUG defined.
>> Again, this should probably be mentioned in the changelog.
> 
> I doesn't matter to me one way or the other whether these statements are
> enabled by module parameter, I was just thinking that pr_debug was
> generally preferred. I can put the module parameter back or denote this
> in the changelog, whichever is more acceptable.


Actually, you can just remove the debug print. The backlight core has a
similar message already, so no need to duplicate it here. Note this
reasoning in the changelog though.

~Ryan


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