Provided by: systemtap-doc_3.1-3ubuntu0.1_all 

NAME
function::MAJOR - Extract major device number from a kernel device number (kdev_t)
SYNOPSIS
MAJOR:long(dev:long)
ARGUMENTS
dev
Kernel device number to query.
SEE ALSO
tapset::dev(3stap)
SystemTap Tapset Reference March 2016 FUNCTION::MAJOR(3stap)