linux-kernel - Re: [PATCH 1/7] mm: interval tree updates

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Date:	Fri, 7 Sep 2012 15:13:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, riel@...hat.com, peterz@...radead.org,
	aarcange@...hat.com, hughd@...gle.com, daniel.santos@...ox.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] mm: interval tree updates

On Tue,  4 Sep 2012 02:20:51 -0700
Michel Lespinasse <walken@...gle.com> wrote:

> This commit updates the generic interval tree code that was
> introduced in "mm: replace vma prio_tree with an interval tree".
> 
> Changes:
> 
> - fixed 'endpoing' typo noticed by Andrew Morton
> 
> - replaced include/linux/interval_tree_tmpl.h, which was used as a
>   template (including it automatically defined the interval tree
>   functions) with include/linux/interval_tree_generic.h, which only
>   defines a preprocessor macro INTERVAL_TREE_DEFINE(), which itself
>   defines the interval tree functions when invoked. Now that is a very
>   long macro which is unfortunate, but it does make the usage sites
>   (lib/interval_tree.c and mm/interval_tree.c) a bit nicer than previously.
> 
> - make use of RB_DECLARE_CALLBACKS() in the INTERVAL_TREE_DEFINE() macro,
>   instead of duplicating that code in the interval tree template.
> 
> - replaced vma_interval_tree_add(), which was actually handling the
>   nonlinear and interval tree cases, with vma_interval_tree_insert_after()
>   which handles only the interval tree case and has an API that is more
>   consistent with the other interval tree handling functions.
>   The nonlinear case is now handled explicitly in kernel/fork.c dup_mmap().
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>
> ---
>  include/linux/interval_tree_generic.h |  191 ++++++++++++++++++++++++++++
>  include/linux/interval_tree_tmpl.h    |  219 ---------------------------------

Well that's a mess.  We create interval_tree_generic.h then four
commits later it vanishes, never to return.  And I can't fold
mm-interval-tree-updates.patch into
mm-replace-vma-prio_tree-with-an-interval-tree.patch because
rbtree-move-augmented-rbtree-functionality-to-rbtree_augmentedh.patch
mucks with interval_tree_generic.h within those four commits.

Ho hum.  I don't think I can be bothered untangling all this.
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