Difference between printk and pr_info

c linux-kernel kernel-module printk
Jarvis picture Jarvis · Feb 15, 2017 · Viewed 13.9k times · Source

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

Answer

barcelona_delpy picture barcelona_delpy · Feb 15, 2017

The kernel's printk.h has:

#define pr_info(fmt,arg...) \
    printk(KERN_INFO fmt,##arg)

Just like the name, pr_info is printk with the KERN_INFO priority.

Related questions

Read/write files within a Linux kernel module

I know all the discussions about why one should not read/write files from kernel, instead how to use /proc or netlink to do that. I want to read/write anyway. I have also read Driving Me Nuts - Things …

Read More
kvm: module verification failed: signature and/or required key missing - tainting kernel

I'm using Ubuntu 14.04 LTS and kernel version 3.13.11.4. I'm trying to load patched KVM modules kvm and kvm-intel and I'm getting the following errors kvm: module verification failed: signature and/or required key missing - tainting kernel and kvm: module has …

Read More
insmod fails with "Unknown symbol in module" for a symbol defined in another module

I am working in Ubuntu. I am trying to make two kernel modules which uses each other functions. My problem is that I got modules properly compiled, but the symbol is not resolved for one of them. To make things …

Read More