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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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37
arch/x86/mm/pat_rbtree.c
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@@ -69,41 +69,8 @@ static u64 compute_subtree_max_end(struct memtype *data)
return max_end;
}
/* Update 'subtree_max_end' for node and its parents */
static void memtype_rb_propagate_cb(struct rb_node *node, struct rb_node *stop)
{
while (node != stop) {
struct memtype *data = container_of(node, struct memtype, rb);
u64 subtree_max_end = compute_subtree_max_end(data);
if (data->subtree_max_end == subtree_max_end)
break;
data->subtree_max_end = subtree_max_end;
node = rb_parent(&data->rb);
}
}
static void memtype_rb_copy_cb(struct rb_node *old, struct rb_node *new)
{
struct memtype *old_data = container_of(old, struct memtype, rb);
struct memtype *new_data = container_of(new, struct memtype, rb);
new_data->subtree_max_end = old_data->subtree_max_end;
}
/* Update 'subtree_max_end' after tree rotation. old and new are the
* former and current subtree roots */
static void memtype_rb_rotate_cb(struct rb_node *old, struct rb_node *new)
{
struct memtype *old_data = container_of(old, struct memtype, rb);
struct memtype *new_data = container_of(new, struct memtype, rb);
new_data->subtree_max_end = old_data->subtree_max_end;
old_data->subtree_max_end = compute_subtree_max_end(old_data);
}
static const struct rb_augment_callbacks memtype_rb_augment_cb = {
memtype_rb_propagate_cb, memtype_rb_copy_cb, memtype_rb_rotate_cb
};
RB_DECLARE_CALLBACKS(static, memtype_rb_augment_cb, struct memtype, rb,
u64, subtree_max_end, compute_subtree_max_end)
/* Find the first (lowest start addr) overlapping range from rb tree */
static struct memtype *memtype_rb_lowest_match(struct rb_root *root,