linux-kernel - Re: smaller kernel with no real time futexes

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Message-ID: <20070801231043.GP2063@devserv.devel.redhat.com>
Date:	Wed, 1 Aug 2007 19:10:43 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Adrian Bunk <bunk@...sta.de>, linux-kernel@...r.kernel.org
Subject: Re: smaller kernel with no real time futexes

On Wed, Aug 01, 2007 at 09:24:34PM +0200, Andi Kleen wrote:
> Adrian,
> 
> You said earlier you're looking at smaller allnoconfig kernels.
> One thing I noticed recently that realtime pi futexes are always
> enabled and that pulls in a lot of other code (like the plists) 
> 
> Userland needs to handle them not being available anyways for older
> kernels.
> 
> Might be worth looking into turning that into a CONFIG.

That's a very bad idea.  glibc configured for 2.6.18 and higher kernels
assumes PI futexes are present.

	Jakub
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