Here’s a
detailed blog entry from Dan Carpenter on adding improved lock checking
to the smatch static-analysis tool. “When Smatch gained the
ability to do cross function analysis in 2010, I knew that I had to
re-write the locking check to take advantage of the new cross function
analysis feature. When you combine cross function analysis with top of the
line flow analysis available and in depth knowledge of kernel locks then
the result is the Ultimate Locking Check! Unfortunately, I have a tendency
towards procrastination and it took me a decade to get around to it, but it
is done now. This blog will step through how the locking analysis
works.“

Source: LWN.net – Carpenter: Writing the Ultimate Locking Check