Date: Tue, 20 Dec 2005 14:19:56 +0100
From: Ingo Molnar <mingo@elte.hu>
To: David Singleton <dsingleton@mvista.com>
Cc: dino@in.ibm.com, linux-kernel@vger.kernel.org,
       robustmutexes@lists.osdl.org
Subject: Re: Recursion bug in -rt
Message-ID: <20051220131956.GA24408@elte.hu>
References: <20051214223912.GA4716@in.ibm.com> <43A1BD61.5070409@mvista.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <43A1BD61.5070409@mvista.com>
User-Agent: Mutt/1.4.2.1i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 895
Lines: 27


* David Singleton <dsingleton@mvista.com> wrote:

> Dinakar,
>     after further testing and investigation I believe you original 
> assessment was correct.
> The problem you are seeing is not a library problem.
> The changes to down_futex need to be reverted.  There is a new patch at
> 
> http://source.mvista.com/~dsingleton/patch-2.6.15-rc5-rt2-rf2.
> 
> that reverts the changes to down_futex.

hm, i'm looking at -rf4 - these changes look fishy:

-       _raw_spin_lock(&lock_owner(lock)->task->pi_lock);
+       if (current != lock_owner(lock)->task)
+               _raw_spin_lock(&lock_owner(lock)->task->pi_lock);

why is this done?

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/