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rbtree: add RB_DECLARE_CALLBACKS() macro

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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>
This commit is contained in:
Michel Lespinasse 2012-10-08 16:31:21 -07:00 • committed by Linus Torvalds
parent 9d9e6f9703
commit 3908836aa7
3 changed files with 34 additions and 67 deletions
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34
lib/rbtree_test.c
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@ -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)
{