Add the ability to dynamically enable/disable pr_debug()/dev_dbg() in the--snip --
kernel. Yes, these calls could be converted to printk(KERN_DEBUG), but there
are enough to cause overhead. Additionally, the logs become difficult to read.
Here, one can turn on and off these messages per .c source file via:
echo "add file.c" > /sys/kernel/debug/dynamic_printk/files
echo "remove file.c" > /sys/kernel/debug/dynamic_printk/files
There is also a special 'all' value that turns on all the debugging messages.
Signed-off-by: Jason Baron <jbaron@xxxxxxxxxx>
---
diff --git a/include/linux/device.h b/include/linux/device.h
index db375be..b007f61 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -587,6 +587,17 @@ extern const char *dev_driver_string(struct device *dev);
#define dev_info(dev, format, arg...) \
dev_printk(KERN_INFO , dev , format , ## arg)
+#ifdef CONFIG_DYNAMIC_PRINTK
+extern void dyanmic_printk(char *, char *, ...);