Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
function::atomic_read - Retrieves an atomic variable from kernel memory
SYNOPSIS
atomic_read:long(addr:long)
ARGUMENTS
addr
pointer to atomic variable
DESCRIPTION
Safely perform the read of an atomic variable.
SystemTap Tapset Reference March 2016 FUNCTION::ATOMIC_REA(3stap)