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| author | Michel Lespinasse <walken@google.com> | 2012-10-08 16:31:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:38 +0900 |
| commit | 3908836aa77e3621aaf2101f2920e01d7c8460d6 (patch) | |
| tree | 3e8f5b619f9e093d9d53180bb6f496319ddeb946 /include/linux/rbtree.h | |
| parent | 9d9e6f9703bbd642f3f2f807e6aaa642a4cbcec9 (diff) | |
| download | linux-stable-3908836aa77e3621aaf2101f2920e01d7c8460d6.tar.gz linux-stable-3908836aa77e3621aaf2101f2920e01d7c8460d6.tar.bz2 linux-stable-3908836aa77e3621aaf2101f2920e01d7c8460d6.zip | |
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>
Diffstat (limited to 'include/linux/rbtree.h')
| -rw-r--r-- | include/linux/rbtree.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index 4ace31b33380..8d1e83b1c87b 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -79,6 +79,36 @@ rb_insert_augmented(struct rb_node *node, struct rb_root *root, __rb_insert_augmented(node, root, augment->rotate); } +#define RB_DECLARE_CALLBACKS(rbstatic, rbname, rbstruct, rbfield, \ + rbtype, rbaugmented, rbcompute) \ +static void rbname ## _propagate(struct rb_node *rb, struct rb_node *stop) \ +{ \ + while (rb != stop) { \ + rbstruct *node = rb_entry(rb, rbstruct, rbfield); \ + rbtype augmented = rbcompute(node); \ + if (node->rbaugmented == augmented) \ + break; \ + node->rbaugmented = augmented; \ + rb = rb_parent(&node->rbfield); \ + } \ +} \ +static void rbname ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \ +{ \ + rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \ + rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \ + new->rbaugmented = old->rbaugmented; \ +} \ +static void rbname ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \ +{ \ + rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \ + rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \ + new->rbaugmented = old->rbaugmented; \ + old->rbaugmented = rbcompute(old); \ +} \ +rbstatic const struct rb_augment_callbacks rbname = { \ + rbname ## _propagate, rbname ## _copy, rbname ## _rotate \ +}; + /* Find logical next and previous nodes in a tree */ extern struct rb_node *rb_next(const struct rb_node *); |