linux-kernel - Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at kernel/locking/rtmutex.c:997!

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Date:	Thu, 09 Apr 2015 16:56:06 -0600
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Thavatchai Makphaibulchoke <tmac@...com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com,
	linux-rt-users@...r.kernel.org, umgwanakikbuti@...il.com,
	Peter Zijlstra <peterz@...radead.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at
 kernel/locking/rtmutex.c:997!



On 04/08/2015 02:50 AM, Thomas Gleixner wrote:
> 
> Don't even try to get this working. Taking the lock in idle/interrupt
> context is just plain wrong.
> 

Thanks for the comments.

Could you please confirm you meant rt_mutex as it can go to sleep.

> The proper solution is to get rid of the locking requirement and that
> needs some thought on the timer wheel code.
> 

Yes, I agree fixing the problem in the timer code is the proper
solution.  BTW, once the code is fixed, I think we should add
WARN_ON(in_irq()); to the function spin_do_trylock() to prevent any
invalid future usage.

Thanks,
Mak.

> Thanks,
> 
> 	tglx
> 



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