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authorMichel Lespinasse <walken@google.com>2019-09-25 16:46:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-25 17:51:39 -0700
commit315cc066b8ae8349a27887ad7a34e1916e9797fe (patch)
tree3c7dba850cee3ec6991228ae425db0de78fbb252 /drivers/block
parent444b8a83f1e01584ff2d53f5951d8e836c0070b5 (diff)
downloadlinux-315cc066b8ae8349a27887ad7a34e1916e9797fe.tar.bz2
augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macro
Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks for the case where the augmented value is a scalar whose definition follows a max(f(node)) pattern. This actually covers all present uses of RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the various RBCOMPUTE function definitions. [walken@google.com: fix mm/vmalloc.c] Link: http://lkml.kernel.org/r/CANN689FXgK13wDYNh1zKxdipeTuALG4eKvKpsdZqKFJ-rvtGiQ@mail.gmail.com [walken@google.com: re-add check to check_augmented()] Link: http://lkml.kernel.org/r/20190727022027.GA86863@google.com Link: http://lkml.kernel.org/r/20190703040156.56953-3-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/drbd/drbd_interval.c29
1 files changed, 3 insertions, 26 deletions
diff --git a/drivers/block/drbd/drbd_interval.c b/drivers/block/drbd/drbd_interval.c
index c58986556161..651bd0236a99 100644
--- a/drivers/block/drbd/drbd_interval.c
+++ b/drivers/block/drbd/drbd_interval.c
@@ -13,33 +13,10 @@ sector_t interval_end(struct rb_node *node)
return this->end;
}
-/**
- * compute_subtree_last - compute end of @node
- *
- * The end of an interval is the highest (start + (size >> 9)) value of this
- * node and of its children. Called for @node and its parents whenever the end
- * may have changed.
- */
-static inline sector_t
-compute_subtree_last(struct drbd_interval *node)
-{
- sector_t max = node->sector + (node->size >> 9);
-
- if (node->rb.rb_left) {
- sector_t left = interval_end(node->rb.rb_left);
- if (left > max)
- max = left;
- }
- if (node->rb.rb_right) {
- sector_t right = interval_end(node->rb.rb_right);
- if (right > max)
- max = right;
- }
- return max;
-}
+#define NODE_END(node) ((node)->sector + ((node)->size >> 9))
-RB_DECLARE_CALLBACKS(static, augment_callbacks, struct drbd_interval, rb,
- sector_t, end, compute_subtree_last);
+RB_DECLARE_CALLBACKS_MAX(static, augment_callbacks,
+ struct drbd_interval, rb, sector_t, end, NODE_END);
/**
* drbd_insert_interval - insert a new interval into a tree