Push a location to the jumplist

Question

My vim plugin has a command to jump to a different location (just like tags).

I use the cursor function for that.

How do I record the previous location in the jumplist, so that Ctrl+O works as expected?

Answer 1

I myself also wanted to this, and what works for me was mark ` before cursor move.

normal! m`
call cursor(l, c)

As help indicate, both setpos() and cursor() don't modify jumplist, so what's the difference of setpos() and cursor(), strange!