linux-kernel - Re: [PATCH 2/12] mm: let swap use exceptional entries

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Message-ID: <alpine.LSU.2.00.1107191538460.1565@sister.anvils>
Date:	Tue, 19 Jul 2011 15:46:14 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/12] mm: let swap use exceptional entries

On Wed, 13 Jul 2011, Andrew Morton wrote:
> On Tue, 12 Jul 2011 15:08:58 -0700 (PDT)
> Hugh Dickins <hughd@...gle.com> wrote:
> > 
> > I'll keep the bland naming, if that's okay, but send a patch adding
> > a line of comment in such places.  Mentioning shmem, tmpfs, swap.
> 
> A better fix would be to create a nicely-documented filemap-specific
> function with a non-bland name which simply wraps
> radix_tree_exception().

I did yesterday try out page_tree_entry_is_not_a_page() to wrap
radix_tree_exceptional_entry(); but (a) I'm wary of negative names,
(b) it was hard to explain why radix_tree_deref_retry() is not a
part of that case, and (c) does a further wrapper help or obscure?

I've skirted the issue in the patch 3/3 I'm about to send you,
maybe you'll think it an improvement, maybe not: I'm neutral.

Hugh
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