path: root/tools/testing/radix-tree
diff options
authorRoss Zwisler <>2016-05-20 17:02:26 -0700
committerLinus Torvalds <>2016-05-20 17:58:30 -0700
commit21ef533931f73a8e963a6107aa5ec51b192f28be (patch)
treebc5066db87ca565cbc35e3535e88b1e5ec1beb41 /tools/testing/radix-tree
parent7b60e9ad59a31dd98c2f7ef841e2882c2b0e0f3b (diff)
radix-tree: add support for multi-order iterating
This enables the macros radix_tree_for_each_slot() and friends to be used with multi-order entries. The way that this works is that we treat all entries in a given slots[] array as a single chunk. If the index given to radix_tree_next_chunk() happens to point us to a sibling entry, we will back up iter->index so that it points to the canonical entry, and that will be the place where we start our iteration. As we're processing a chunk in radix_tree_next_slot(), we process canonical entries, skip over sibling entries, and restart the chunk lookup if we find a non-sibling indirect pointer. This drops back to the radix_tree_next_chunk() code, which will re-walk the tree and look for another chunk. This allows us to properly handle multi-order entries mixed with other entries that are at various heights in the radix tree. Signed-off-by: Ross Zwisler <> Signed-off-by: Matthew Wilcox <> Cc: Konstantin Khlebnikov <> Cc: Kirill Shutemov <> Cc: Jan Kara <> Cc: Neil Brown <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'tools/testing/radix-tree')
2 files changed, 4 insertions, 4 deletions
diff --git a/tools/testing/radix-tree/generated/autoconf.h b/tools/testing/radix-tree/generated/autoconf.h
new file mode 100644
index 000000000000..ad18cf5a2a3a
--- /dev/null
+++ b/tools/testing/radix-tree/generated/autoconf.h
@@ -0,0 +1,3 @@
+#define CONFIG_SHMEM 1
+#define CONFIG_SWAP 1
diff --git a/tools/testing/radix-tree/linux/kernel.h b/tools/testing/radix-tree/linux/kernel.h
index 8ea0ed450810..be98a47b4e1b 100644
--- a/tools/testing/radix-tree/linux/kernel.h
+++ b/tools/testing/radix-tree/linux/kernel.h
@@ -8,10 +8,7 @@
#include <limits.h>
#include "../../include/linux/compiler.h"
-#define CONFIG_SWAP
+#include "../../../include/linux/kconfig.h"