linux-kernel - Re: [PATCH] PREEMPT_RT

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Message-ID: <alpine.LFD.2.02.1109012112100.2723@ionos>
Date:	Thu, 1 Sep 2011 21:14:42 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Kacur <jkacur@...hat.com>
cc:	rt-users <linux-rt-users@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PREEMPT_RT_FULL Build error fix

On Fri, 26 Aug 2011, John Kacur wrote:

> Problem:
> make O=/bld/3.0.3-rt11/ kernel/fork.o
> /home/jkacur/jk-2.6/kernel/fork.c:91: error: section of ‘name’ conflicts with previous declaration
> 
> __cacheline_aligned is already part of the definition of DEFINE_RWLOCK
> for -rt
> 
> However it is not always used for the tasklist_lock in non-rt, so it can't
> simply be added to the definition of DEFINE_RWLOCK in non-rt, so I modified
> the definition in fork.c

-ENOPARSE

The real question is whether RWLOCKS should be cacheline aligned in
general or the RT addon is just overkill. Slapping an ifdef around
does not answer that.

Thanks,

	tglx