Difference between revisions of "Debugging by printing"

From eLinux.org
Jump to: navigation, search
Line 14: Line 14:
 
* early_printk
 
* early_printk
 
* printascii, printch and printhex (on ARM only?)
 
* printascii, printch and printhex (on ARM only?)
 +
* /dev/kmsg
  
 
* Examples - maybe use example module.
 
* Examples - maybe use example module.

Revision as of 21:20, 14 June 2011


Note: This article is currently only a draft and is a part of a series of articles I'm going to publish the next few months - if you want to contribute to it, please feel free to. However it would be nice if you could coordinate your efforts with me



What this article will be about - ideas

  • printk format
  • Debug/log levels - dmesg -n /proc/sys/kernel/printk
  • printk_ratelimited
  • dynamic debug, pr_debug and dev_dbg
  • pr_warn and family - see printk.h for details
  • early_printk
  • printascii, printch and printhex (on ARM only?)
  • /dev/kmsg
  • Examples - maybe use example module.


References

  • Linux Kernel Development 3rd Edition
  • Essential Device Drivers


External links