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@posteo.de> wrote:
Am 16.04.2014 11:58 schrieb Arun KS:
Hi Martin,
On Wed, Apr 16, 2014 at 2:46 PM, Martin Kepplinger <martink@posteo.de> wrote:
Am 2014-04-16 11:00, schrieb Arun KS:
Hi Martin, >> On Wed, Apr 16, 2014 at 2:13 PM, Martin Kepplinger <martink@posteo.de> 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
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