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

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

lib/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -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

lib/Kconfig.debug

+1 −0
Original line number Diff line number Diff line
@@ -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

lib/Makefile

+1 −2
Original line number Diff line number Diff line
@@ -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

lib/interval_tree.c

+6 −0
Original line number Diff line number Diff line 
#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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