Am 16.04.2014 13:43 schrieb Denis Pithon: > Martin, > > I'm not sure did you enable DDEBUG when compiling your module ? > pr_debug() macro is discarded if you omit DEBUG in compile time > > A sample Makefile which enable pr_debug() : > > obj-m += my_modue.o > > KDIR ?= /lib/modules/`uname -r`/build > CFLAGS_my_module.o := -DDEBUG > > all: > make -C $(KDIR) M=$(PWD) modules > > clean: > make -C $(KDIR) M=$(PWD) clean > > Let me know ... > regards Thanks, I did not, but now added -DDEBUG. The exact line is: CFLAGS_my_module.o := -DDEBUG when "my_module.o" is my object file. Did I get that right? That doesn't change anything unfortunately. I can not read pr_debug() unless I explicitely activate it in /sys/kernel/debug/dynamic_debug/control *after* insmod. I'd like to just read all pr_debug() messages like pr_info(). thanks for your time! > > On Wed, Apr 16, 2014 at 1:11 PM, Martin Kepplinger <martink@xxxxxxxxx> > wrote: > >> 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] >>>>>> [1] >> >>> >> >>>>> _______________________________________________ >>>>> Kernelnewbies mailing list >>>>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies [1] >>>>> [1] >> >>> >> >>>> >>>> >>>> _______________________________________________ >>>> Kernelnewbies mailing list >>>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies [1] >>>> [1] >>> >>> Links: >>> ------ >>> [1] 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
