Commit a88cc108 authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter

lib: Export interval_tree

lib/interval_tree.c provides a simple interface for an interval-tree
(an augmented red-black tree) but is only built when testing the generic
macros for building interval-trees. For drivers with modest needs,
export the simple interval-tree library as is.

v2: Lots of help from Michel Lespinasse to only compile the code
    as required:
    - make INTERVAL_TREE a config option
    - make INTERVAL_TREE_TEST select the library functions
      and sanitize the filenames & Makefile
    - prepare interval_tree for being built as a module if required
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: 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>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarMichel Lespinasse <walken@google.com>
[Acked for inclusion via drm/i915 by Andrew Morton.]
[danvet: switch to _GPL as per the mailing list discussion.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 8d4eee9c
......@@ -331,6 +331,20 @@ config TEXTSEARCH_FSM
config BTREE
boolean
config INTERVAL_TREE
boolean
help
Simple, embeddable, interval-tree. Can find the start of an
overlapping range in log(n) time and then iterate over all
overlapping nodes. The algorithm is implemented as an
augmented rbtree.
See:
Documentation/rbtree.txt
for more information.
config ASSOCIATIVE_ARRAY
bool
help
......
......@@ -1496,6 +1496,7 @@ config RBTREE_TEST
config INTERVAL_TREE_TEST
tristate "Interval tree test"
depends on m && DEBUG_KERNEL
select INTERVAL_TREE
help
A benchmark measuring the performance of the interval tree library
......
......@@ -50,6 +50,7 @@ CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS))
obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
obj-$(CONFIG_BTREE) += btree.o
obj-$(CONFIG_INTERVAL_TREE) += interval_tree.o
obj-$(CONFIG_ASSOCIATIVE_ARRAY) += assoc_array.o
obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
obj-$(CONFIG_DEBUG_LIST) += list_debug.o
......@@ -156,8 +157,6 @@ lib-$(CONFIG_LIBFDT) += $(libfdt_files)
obj-$(CONFIG_RBTREE_TEST) += rbtree_test.o
obj-$(CONFIG_INTERVAL_TREE_TEST) += interval_tree_test.o
interval_tree_test-objs := interval_tree_test_main.o interval_tree.o
obj-$(CONFIG_PERCPU_TEST) += percpu_test.o
obj-$(CONFIG_ASN1) += asn1_decoder.o
......
#include <linux/init.h>
#include <linux/interval_tree.h>
#include <linux/interval_tree_generic.h>
#include <linux/module.h>
#define START(node) ((node)->start)
#define LAST(node) ((node)->last)
......@@ -8,3 +9,8 @@
INTERVAL_TREE_DEFINE(struct interval_tree_node, rb,
unsigned long, __subtree_last,
START, LAST,, interval_tree)
EXPORT_SYMBOL_GPL(interval_tree_insert);
EXPORT_SYMBOL_GPL(interval_tree_remove);
EXPORT_SYMBOL_GPL(interval_tree_iter_first);
EXPORT_SYMBOL_GPL(interval_tree_iter_next);
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