linux-kernel - [PATCH 3.18 02/31] lib/interval_tree

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Message-Id: <20181220085742.694672774@linuxfoundation.org>
Date:   Thu, 20 Dec 2018 10:18:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 3.18 02/31] lib/interval_tree_test.c: allow full tree search

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit c46ecce431ebe6b1a9551d1f530eb432dae5c39b ]

...  such that a user can specify visiting all the nodes in the tree
(intersects with the world).  This is a nice opposite from the very
basic default query which is a single point.

Link: http://lkml.kernel.org/r/20170518174936.20265-5-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 lib/interval_tree_test.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index 1093f0496d5e..409383463879 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -15,6 +15,7 @@ __param(int, perf_loops, 100000, "Number of iterations modifying the tree");
 
 __param(int, nsearches, 100, "Number of searches to the interval tree");
 __param(int, search_loops, 10000, "Number of iterations searching the tree");
+__param(bool, search_all, false, "Searches will iterate all nodes in the tree");
 
 
 static struct rb_root root = RB_ROOT;
@@ -24,13 +25,13 @@ static u32 *queries = NULL;
 static struct rnd_state rnd;
 
 static inline unsigned long
-search(unsigned long query, struct rb_root *root)
+search(struct rb_root *root, unsigned long start, unsigned long last)
 {
 	struct interval_tree_node *node;
 	unsigned long results = 0;
 
-	for (node = interval_tree_iter_first(root, query, query); node;
-	     node = interval_tree_iter_next(node, query, query))
+	for (node = interval_tree_iter_first(root, start, last); node;
+	     node = interval_tree_iter_next(node, start, last))
 		results++;
 	return results;
 }
@@ -99,8 +100,12 @@ static int interval_tree_test_init(void)
 
 	results = 0;
 	for (i = 0; i < search_loops; i++)
-		for (j = 0; j < nsearches; j++)
-			results += search(queries[j], &root);
+		for (j = 0; j < nsearches; j++) {
+			unsigned long start = search_all ? 0 : queries[j];
+			unsigned long last = search_all ? max_endpoint : queries[j];
+
+			results += search(&root, start, last);
+		}
 
 	time2 = get_cycles();
 	time = time2 - time1;
-- 
2.19.1