linux-kernel - Re: [PATCH v1] driver core: convert printk(KERN_<LEVEL> ...) to pr

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Date:   Mon, 27 Aug 2018 08:52:27 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] driver core: convert printk(KERN_<LEVEL> ...) to
 pr_<level>

On Mon, 2018-08-27 at 18:27 +0300, Andy Shevchenko wrote:
> Convert printk:s to pr_* format.
> 
> Note, printk(KERN_DEBUG ...) is left untouched due to side effects
>       of pr_debug().
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/base/dd.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index edfc9f0b1180..f0434695961f 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -321,8 +321,8 @@ bool device_is_bound(struct device *dev)
>  static void driver_bound(struct device *dev)
>  {
>  	if (device_is_bound(dev)) {
> -		printk(KERN_WARNING "%s: device %s already bound\n",
> -			__func__, kobject_name(&dev->kobj));
> +		pr_warn("%s: device %s already bound\n", __func__,
> +			kobject_name(&dev->kobj));
_
While I believe adding __func__ to printks is not generally
useful, perhaps it's better to use pr_fmt like:

#define pr_fmt(fmt) "%s: " fmt, __func__

to make it easier to remove the __func__ uses too.

Maybe
---
 drivers/base/dd.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index edfc9f0b1180..5ad3a7f77013 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -16,6 +16,8 @@
  * Copyright (c) 2007-2009 Novell Inc.
  */
 
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/delay.h>
@@ -321,13 +323,12 @@ bool device_is_bound(struct device *dev)
 static void driver_bound(struct device *dev)
 {
 	if (device_is_bound(dev)) {
-		printk(KERN_WARNING "%s: device %s already bound\n",
-			__func__, kobject_name(&dev->kobj));
+		pr_warn("device %s already bound\n", kobject_name(&dev->kobj));
 		return;
 	}
 
-	pr_debug("driver: '%s': %s: bound to device '%s'\n", dev->driver->name,
-		 __func__, dev_name(dev));
+	pr_debug("driver: '%s': bound to device '%s'\n",
+		 dev->driver->name, dev_name(dev));
 
 	klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
 	device_links_driver_bound(dev);
@@ -468,8 +469,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		return ret;
 
 	atomic_inc(&probe_count);
-	pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
-		 drv->bus->name, __func__, drv->name, dev_name(dev));
+	pr_debug("bus: '%s': probing driver %s with device %s\n",
+		 drv->bus->name, drv->name, dev_name(dev));
 	WARN_ON(!list_empty(&dev->devres_head));
 
 re_probe:
@@ -485,8 +486,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		goto dma_failed;
 
 	if (driver_sysfs_add(dev)) {
-		printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",
-			__func__, dev_name(dev));
+		pr_err("driver_sysfs_add(%s) failed\n", dev_name(dev));
 		goto probe_failed;
 	}
 
@@ -532,8 +532,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 
 	driver_bound(dev);
 	ret = 1;
-	pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
-		 drv->bus->name, __func__, dev_name(dev), drv->name);
+	pr_debug("bus: '%s': bound device %s to driver %s\n",
+		 drv->bus->name, dev_name(dev), drv->name);
 	goto done;
 
 probe_failed:
@@ -566,9 +566,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		break;
 	default:
 		/* driver matched but the probe failed */
-		printk(KERN_WARNING
-		       "%s: probe of %s failed with error %d\n",
-		       drv->name, dev_name(dev), ret);
+		pr_warn("probe of %s failed with error %d\n",
+			drv->name, dev_name(dev), ret);
 	}
 	/*
 	 * Ignore errors returned by ->probe so that the next driver can try
@@ -606,8 +605,7 @@ static int really_probe_debug(struct device *dev, struct device_driver *drv)
  */
 int driver_probe_done(void)
 {
-	pr_debug("%s: probe_count = %d\n", __func__,
-		 atomic_read(&probe_count));
+	pr_debug("probe_count = %d\n", atomic_read(&probe_count));
 	if (atomic_read(&probe_count))
 		return -EBUSY;
 	return 0;
@@ -648,8 +646,8 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
 	if (!device_is_registered(dev))
 		return -ENODEV;
 
-	pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
-		 drv->bus->name, __func__, dev_name(dev), drv->name);
+	pr_debug("bus: '%s': matched device %s with driver %s\n",
+		 drv->bus->name, dev_name(dev), drv->name);
 
 	pm_runtime_get_suppliers(dev);
 	if (dev->parent)