Am 16.04.2014 11:58 schrieb Arun KS: > Hi Martin, > > On Wed, Apr 16, 2014 at 2:46 PM, Martin Kepplinger <martink@xxxxxxxxx> > wrote: >> 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/* > So now you know why your pr_debug is absent in logbuf. > > You can make your module as a built in and use bootargs. > > eg: > dyndbg="file your_filename.c +p" > > Thanks, > Arun > So it's *not* possible at all to get pr_debug() messages just like pr_info() messages? Of what I've read, I assumed pr_debug() is just loglevel 7. thanks for your help! >> >>> >>> >>> 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 [1] > >> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies [1] > >> >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies [1] > > Links: > ------ > [1] 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
