linux-kernel - Re: [PATCH 1/3] replace PAGECACHE_TAG

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Message-ID: <538CA269.6010300@intel.com>
Date:	Mon, 02 Jun 2014 09:12:25 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Konstantin Khlebnikov <koct9i@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Johannes Weiner <hannes@...xchg.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>,
	Andres Freund <andres@...quadrant.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] replace PAGECACHE_TAG_* definition with enumeration

On 06/01/2014 10:24 PM, Naoya Horiguchi wrote:
> -#define PAGECACHE_TAG_DIRTY	0
> -#define PAGECACHE_TAG_WRITEBACK	1
> -#define PAGECACHE_TAG_TOWRITE	2
> +enum {
> +	PAGECACHE_TAG_DIRTY,
> +	PAGECACHE_TAG_WRITEBACK,
> +	PAGECACHE_TAG_TOWRITE,
> +	__NR_PAGECACHE_TAGS,
> +};

Doesn't this end up exposing kernel-internal values out to a userspace
interface?  Wouldn't that lock these values in to the ABI?
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