I try to use the command printk. All the examples I can find on the internet is by putting a string directly in the printk like this: printk(KERN_INFO "Hello %s!", "World"); However, I tried to...

What's the exact difference between printk and pr_info functions ? And under what conditions, should I choose one over the another ?

Is there any tips or method to avoid kernel log drop or log buffer overrun ? I have increased the log buffer size to maximum with below code change. I'm running in high end device only. But, still...

I wrote small kernel module code as mentioned below, I am testing it in ubuntu 14.04 #include <linux/module.h> #include <linux/version.h> #include <linux/kernel.h> #include <...

I am making a simple enque/deque program in kernel. I want to print message in kernel, and this is what I got: [18594.595747] Enqueue 3 [18594.595748] queue : [18594.595751] 2 [18594.595751] 1 ...

I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel...

I am debugging a driver for linux (specifically ubuntu server 9.04), and there are several printf statements in the code. Where can I view the output of these statements? EDIT1: What i'm trying t...

I am trying to understand a Linux kernel module and would like to see the output of pr_debug and printk. I am using GNU Make. I understand that to get pr_debug messages, we have to use DDEBUG. So...

I am working on a Linux character device driver for a school assignment and am not sure how to print the *ppos passed into my read function which is of type loff_t. I know I must use printk rathe...

I am modifying the kvm module and I have added printk statements in the kernel code.After running the virtual machine, printk gives me the faulting address and other information about the guest OS....

I am writing a kernel module, and I want to be able to print something on the console output when loading it using insmod module.ko. I tried using printk(KERN_EMERG "test kernel emergency\n"); ...

everybody knows that interrupt handler should be short as possible. and adding functions like printk for debugging inside an interrupt handler is something that shouldn't be done. Actually, I tried...

I have a doubt. I opened the kernel and I changed the directory linux-3.1.1/fs/open.c I changed the follow code in the open.c. SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, in...

Is there a better way to debug printouts in the Linux kernel? Right now littering the code with: printk(KERN_DBG "%s:%d - %s() <message>", __FILE__, __LINE__, __FUNCTION__ ); Which isn't...