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From: SeongJae Park <sj@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>,
	"Liam R. Howlett" <liam@infradead.org>,
	Alice Ryhl <aliceryhl@google.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org,
	Andrew Ballance <andrewjballance@gmail.com>,
	maple-tree@lists.infradead.org,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] maple_tree: document that "last" in mtree_insert_range() is inclusive
Date: Sat,  9 May 2026 08:38:21 -0700
Message-ID: <20260509153821.90161-1-sj@kernel.org>
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On Sat, 9 May 2026 09:31:13 +0100 Matthew Wilcox <willy@infradead.org> wrote:

> On Fri, May 08, 2026 at 05:59:46PM -0700, SeongJae Park wrote:
> > > > * @first: The start of the range
> > > > * @last: The end of the range (inclusive)
> > > 
> > > 
> > > I like this.
> > 
> > +1.  I'm also wondering if it make sense to add '(inclusive)' for 'first', too.
> 
> I can't think of a situation in computing where we use an
> exclusive-first.  Pure mathematics, yes, we might want to express a
> range as (1,2) to exclude both 1 and 2 but include 1+epsilon for all
> epsilon > 0.  Maybe I don't work with floating point numbers enough,
> but I've never seen a kernel programmer make an off-by-one with the
> start of a range.  End-of-the-range is all too common.

Makes sense, thank you for sharing your thought for my silly question!


Thanks,
SJ