linux-kernel - [PATCH v6] lib/dynamic_debug: make better dynamic log output

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Date:   Fri, 20 Dec 2019 14:02:05 +0800
From:   Huang Shijie <sjhuang@...vatar.ai>
To:     <jbaron@...mai.com>
CC:     <linux-kernel@...r.kernel.org>, <1537577747@...com>,
        Huang Shijie <sjhuang@...vatar.ai>
Subject: [PATCH v6] lib/dynamic_debug: make better dynamic log output

The driver strings, device name and net device name are not changed for
the driver's dynamic log output. But dynamic_emit_prefix() which contains
the function names may change when the function names are changed.

So the patch makes the better dynamic log output.

And after this patch, the output is the same as the non dynamic debug output
except it may have an optional prefix.

Signed-off-by: Huang Shijie <sjhuang@...vatar.ai>
---
v5 --> v6:
	Add more comment from Jason Baron.
---
 lib/dynamic_debug.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index c60409138e13..bfc3b386d603 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -589,9 +589,9 @@ void __dynamic_dev_dbg(struct _ddebug *descriptor,
 	} else {
 		char buf[PREFIX_SIZE];
 
-		dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
-				dynamic_emit_prefix(descriptor, buf),
+		dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s %s %s%pV",
 				dev_driver_string(dev), dev_name(dev),
+				dynamic_emit_prefix(descriptor, buf),
 				&vaf);
 	}
 
@@ -619,11 +619,11 @@ void __dynamic_netdev_dbg(struct _ddebug *descriptor,
 		char buf[PREFIX_SIZE];
 
 		dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
-				"%s%s %s %s%s: %pV",
-				dynamic_emit_prefix(descriptor, buf),
+				"%s %s %s %s %s%pV",
 				dev_driver_string(dev->dev.parent),
 				dev_name(dev->dev.parent),
 				netdev_name(dev), netdev_reg_state(dev),
+				dynamic_emit_prefix(descriptor, buf),
 				&vaf);
 	} else if (dev) {
 		printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
@@ -655,11 +655,11 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
 		char buf[PREFIX_SIZE];
 
 		dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent,
-				"%s%s %s %s: %pV",
-				dynamic_emit_prefix(descriptor, buf),
+				"%s %s %s %s%pV",
 				dev_driver_string(ibdev->dev.parent),
 				dev_name(ibdev->dev.parent),
 				dev_name(&ibdev->dev),
+				dynamic_emit_prefix(descriptor, buf),
 				&vaf);
 	} else if (ibdev) {
 		printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf);
-- 
2.17.1