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lib/rbtree,drm/mm: add rbtree_replace_node_cached()
Add a variant of rbtree_replace_node() that maintains the leftmost cache of struct rbtree_root_cached when replacing nodes within the rbtree. As drm_mm is the only rb_replace_node() being used on an interval tree, the mistake looks fairly self-contained. Furthermore the only user of drm_mm_replace_node() is its testsuite... Testcase: igt/drm_mm/replace Link: http://lkml.kernel.org/r/[email protected] Link: https://patchwork.freedesktop.org/patch/msgid/[email protected] Fixes: f808c13 ("lib/interval_tree: fast overlap detection") Signed-off-by: Chris Wilson <[email protected]> Reviewed-by: Joonas Lahtinen <[email protected]> Acked-by: Davidlohr Bueso <[email protected]> Cc: Jérôme Glisse <[email protected]> Cc: Joonas Lahtinen <[email protected]> Cc: Daniel Vetter <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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