I have a loadable kernel module and its init is as given below
static int __init id_init(void)
{
struct identity *temp;
/* some code which is not relevant to the question */
temp = identity_find(3);
pr_debug("id 3 = %s\n", temp->name);
temp = identity_find(42);
if (temp == NULL)
pr_debug("id 42 not found\n");
/* some code which is not relevant to the question */
return 0;
}
Also I have enabled dynamic debugging enabled on the kernel version I am using - i.e CONFIG_DYNAMIC_DEBUG=y.
And in the Makefile of the module I have added a line CFLAGS_[id].o := -DDEBUG where id.c is the file name.
Now I checked in the /sys/kernel/debug/dynamic_debug/control after doing insmod of this module, in which I found the below lines
/home/pauldc/Programming/Kernel/id/id.c:69 [id]id_init =_ "id 42 not found\012"
/home/pauldc/Programming/Kernel/id/id.c:65 [id]id_init =_ "id 3 = %s\012"
Even after doing all this, to my disappointment I could not find the above two pr_debug statements in the output of dmesg. So what am I missing or doing wrong?
Add following to Makefile, assuming filename.c is the module source file.
CFLAGS_filename.o := -DDEBUG
not
CFLAGS_[filename].o := -DDEBUG