rbtree: add RB_DECLARE_CALLBACKS() macro

As proposed by Peter Zijlstra, this makes it easier to define the augmented
rbtree callbacks.

Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 32 deletions

diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index e28345df09bf..b20e99969b0f 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -61,38 +61,8 @@ static inline u32 augment_recompute(struct test_node *node)
         return max;
 }
 
-static void augment_propagate(struct rb_node *rb, struct rb_node *stop)
-{
-        while (rb != stop) {
-                struct test_node *node = rb_entry(rb, struct test_node, rb);
-                u32 augmented = augment_recompute(node);
-                if (node->augmented == augmented)
-                        break;
-                node->augmented = augmented;
-                rb = rb_parent(&node->rb);
-        }
-}
-
-static void augment_copy(struct rb_node *rb_old, struct rb_node *rb_new)
-{
-        struct test_node *old = rb_entry(rb_old, struct test_node, rb);
-        struct test_node *new = rb_entry(rb_new, struct test_node, rb);
-        new->augmented = old->augmented;
-}
-
-static void augment_rotate(struct rb_node *rb_old, struct rb_node *rb_new)
-{
-        struct test_node *old = rb_entry(rb_old, struct test_node, rb);
-        struct test_node *new = rb_entry(rb_new, struct test_node, rb);
-
-        /* Rotation doesn't change subtree's augmented value */
-        new->augmented = old->augmented;
-        old->augmented = augment_recompute(old);
-}
-
-static const struct rb_augment_callbacks augment_callbacks = {
-        augment_propagate, augment_copy, augment_rotate
-};
+RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb,
+                     u32, augmented, augment_recompute)
 
 static void insert_augmented(struct test_node *node, struct rb_root *root)
 {