linux-kernel - Re: [PATCH] remove no longer use of pdflush interface

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Message-ID: <CAEwNFnDmQZa9gXcKqLXipWSdVfNXszeBWZrc-MDS50A6K0CEww@mail.gmail.com>
Date:	Mon, 4 Jun 2012 22:14:28 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Wanpeng Li <liwp.linux@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Howells <dhowells@...hat.com>,
	James Morris <james.l.morris@...cle.com>,
	Ingo Molnar <mingo@...e.hu>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Wanpeng Li <liwp@...ux.vnet.ibm.com>
Subject: Re: [PATCH] remove no longer use of pdflush interface

On Mon, Jun 4, 2012 at 9:53 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> Hi Wanpeng,
>
> On Mon, Jun 04, 2012 at 08:40:42PM +0800, Wanpeng Li wrote:
>> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>>
>> remove no longer use of pdflush interface nr_pdflush_threads.
>
> The patch looks good in itself: the nr_pdflush_threads takes no effect
> for many of the recent kernels. But what's the normal process of
> interface removal?  Shall we carry some warning printk for some time
> first or whatever?

Yes. you have to add printk warning for noticing it deprecated.
And add descriptoin in Documentation/ABI/obsolete/ and
Documentation/feature-removal-schedule.txt

I don't know how long we maintain it. Is there any rule for it?
Maybe 1-year is suitable, IMHO.

Thanks.
-- 
Kind regards,
Minchan Kim
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