linux-kernel - Re: [PATCH] Define a UNIQUE value for AS

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Message-Id: <20090402095315.1098b6c3.akpm@linux-foundation.org>
Date:	Thu, 2 Apr 2009 09:53:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	stable <stable@...nel.org>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH]  Define a UNIQUE value for AS_UNEVICTABLE flag

On Thu, 02 Apr 2009 12:47:15 -0400 Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> [PATCH] Define UNIQUE value of AS_UNEVICTABLE
> 
> Needed in 2.6.28, 2.6.29, ...
> 
> A new "address_space flag"--AS_MM_ALL_LOCKS--was defined to use the next
> available AS flag while the Unevictable LRU was under development.  The
> Unevictable LRU was using the same flag and "no one" noticed.  Current 
> mainline, since 2.6.28, has same value for two symbolic flag names.

argh.

What are the user-observable effects of the bug, and why didn't anyone
notice it until now?

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