Current documentation referred to the old method of handling augmented
trees.  Update documentation to correspond with the changes done in
commit b945d6b2 ("rbtree: Undo augmented trees performance damage
and regression").

Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: NIngo Molnar <mingo@elte.hu>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NSasha Levin <levinsasha928@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove anticipatory block I/O scheduler info from Documentation/
since the code has been deleted.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Reported-by: N"Robert P. J. Day" <rpjday@crashcourse.ca>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: NJens Axboe <jaxboe@fusionio.com>

Add support for augmented rbtrees in core rbtree code.

This will be used in subsequent patches, in x86 PAT code, which needs
interval trees to efficiently keep track of PAT ranges.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
LKML-Reference: <20100210232343.GA11465@linux-os.sc.intel.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Reviewed-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

 The first formal parameter of the rb_link_node() is a pointer, and the
 "node" is define a data struct (pls see line 67 and line 73 in the
 doc), so the actual parameter should use "&data->node".
Signed-off-by: NFigo.zhang <figo.zhang@kolorific.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation for lib/rbtree.c.
Signed-off-by: NRob Landley <rob@landley.net>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>