linux-kernel - Re: [PATCH 1/2] driver core: printk to pr

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Date:   Sat, 13 Apr 2019 09:57:27 -0700
From:   Joe Perches <joe@...ches.com>
To:     Willy Wolff <willy.mh.wolff.ml@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] driver core: printk to pr_*

On Fri, 2019-04-12 at 16:47 +0100, Willy Wolff wrote:
> Signed-off-by: Willy Wolff <willy.mh.wolff.ml@...il.com>

Most people seem to prefer some type of commit message before
your sign-off.

And trivia:

> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
[]
> @@ -602,8 +601,8 @@ static int really_probe_debug(struct device *dev, struct device_driver *drv)
>  	ret = really_probe(dev, drv);
>  	rettime = ktime_get();
>  	delta = ktime_sub(rettime, calltime);
> -	printk(KERN_DEBUG "probe of %s returned %d after %lld usecs\n",
> -	       dev_name(dev), ret, (s64) ktime_to_us(delta));
> +	pr_debug("probe of %s returned %d after %lld usecs\n",
> +		 dev_name(dev), ret, (s64) ktime_to_us(delta));

While I think this particular change is fine, and you may
already know this, but converting a
	printk(KERN_DEBUG ...)
to
	pr_debug(...)
changes object code and output.

The first is always emitted, the second is not emitted
unless DEBUG is defined or CONFIG_DYNAMIC_DEBUG is enabled.  

Your commit message should show this understanding.