Am 2014-04-16 11:00, schrieb Arun KS: > Hi Martin, > > On Wed, Apr 16, 2014 at 2:13 PM, Martin Kepplinger <martink@xxxxxxxxx> wrote: >> I'm on Debian here and I don't really get pr_debug and printk(KERN_DEBUG >> ...). Let's stick to pr_debug. >> >> I have DYNAMIC_DEBUG enabled and >> root@laptop:/proc/sys/kernel# cat /proc/sys/kernel/printk >> 7 7 1 7 > This shows the console log level. > This file controls the traffic to console. But all the log messages > will be present in logbuf. How do I view debug messages from logbuf? > >> >> I write a module with pr_debug's. I load the module and I *don't* see >> anything in /var/log/messages (or anywhere in /var/log/* ). Adding >> #define DEBUG doesn't help. >> >> /sys/kernel/debug/dynamic_debug/control has the pr_debug entries I use >> in my loaded module. >> >> In short: How do I see debug log messages? Using pr_info() works as >> expected. What am I missing? Do I need to edit my Makefile? > Did you enable dynamic printing for your file? > > Below command enables dynamic printing for file sdhci.c. > echo 'file sdhci.c +p' > /sys/kernel/debug/dynamic_debug/control well. I tried that. The thing is, the pr_debug() symbols are in "control" only after "insmod my_module". Then I can echo -n 'file my_mobule.c +p' > control But my pr_debug() messages get printed directly after insmod, basically in my module_init function. Enabling my file doesn't output anything in /var/log/* > > > Thanks, > Arun >> >> thanks! >> martin >> >> -- >> Martin Kepplinger >> e-mail martink AT posteo DOT at >> chat (XMPP) martink AT jabber DOT at >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
