Default message log level (1-7)

configname: CONFIG_MESSAGE_LOGLEVEL_DEFAULT

Linux Kernel Configuration
└─>Kernel hacking
└─>printk and dmesg options
└─>Default message log level (1-7)
In linux kernel since version 3.17 (release Date: 2014-10-05)  
Default log level for printk statements with no specified priority.

This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
that are auditing their logs closely may want to set it to a lower
priority.

Note: This does not affect what message level gets printed on the console
by default. To change that, use loglevel=<x> in the kernel bootargs,
or pick a different CONSOLE_LOGLEVEL_DEFAULT configuration value.