mm/rmap: Constify the rmap_walk_control argument
The rmap walking functions do not modify the rmap_walk_control, and
page_idle_clear_pte_refs() takes advantage of that to move construction
of the rmap_walk_control to compile time. This lets us remove an
unclean cast.
Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
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