diff options
| author | Michel Lespinasse <walken@google.com> | 2019-09-25 16:46:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-25 17:51:39 -0700 |
| commit | 315cc066b8ae8349a27887ad7a34e1916e9797fe (patch) | |
| tree | 3c7dba850cee3ec6991228ae425db0de78fbb252 /lib | |
| parent | 444b8a83f1e01584ff2d53f5951d8e836c0070b5 (diff) | |
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 'lib')
| -rw-r--r-- | lib/rbtree_test.c | 37 |
1 files changed, 17 insertions, 20 deletions
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c index 62b8ee92643d..41ae3c7570d3 100644 --- a/lib/rbtree_test.c +++ b/lib/rbtree_test.c @@ -77,26 +77,10 @@ static inline void erase_cached(struct test_node *node, struct rb_root_cached *r } -static inline u32 augment_recompute(struct test_node *node) -{ - u32 max = node->val, child_augmented; - if (node->rb.rb_left) { - child_augmented = rb_entry(node->rb.rb_left, struct test_node, - rb)->augmented; - if (max < child_augmented) - max = child_augmented; - } - if (node->rb.rb_right) { - child_augmented = rb_entry(node->rb.rb_right, struct test_node, - rb)->augmented; - if (max < child_augmented) - max = child_augmented; - } - return max; -} +#define NODE_VAL(node) ((node)->val) -RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb, - u32, augmented, augment_recompute) +RB_DECLARE_CALLBACKS_MAX(static, augment_callbacks, + struct test_node, rb, u32, augmented, NODE_VAL) static void insert_augmented(struct test_node *node, struct rb_root_cached *root) @@ -238,7 +222,20 @@ static void check_augmented(int nr_nodes) check(nr_nodes); for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) { struct test_node *node = rb_entry(rb, struct test_node, rb); - WARN_ON_ONCE(node->augmented != augment_recompute(node)); + u32 subtree, max = node->val; + if (node->rb.rb_left) { + subtree = rb_entry(node->rb.rb_left, struct test_node, + rb)->augmented; + if (max < subtree) + max = subtree; + } + if (node->rb.rb_right) { + subtree = rb_entry(node->rb.rb_right, struct test_node, + rb)->augmented; + if (max < subtree) + max = subtree; + } + WARN_ON_ONCE(node->augmented != max); } } |