doc-view-previous-line-or-previous-page
doc-view-previous-line-or-previous-page is an interactive compiled Lisp function in `doc-view.el
'.
(doc-view-previous-line-or-previous-page &optional ARG)
Scroll downward by ARG lines if possible, else goto previous page.
When `doc-view-continuous' is non-nil, scrolling a line downward
at the top edge of the page moves to the previous page.