linux-kernel - Re: RFC: SysRq nice-all-RT-tasks is broken

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Message-Id: <22b0e5fe-2aa1-72de-4d00-29d768d226ca@linux.vnet.ibm.com>
Date:   Wed, 8 Mar 2017 18:03:55 +0100
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Andrew Morton <akpm@...l.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>
Subject: Re: RFC: SysRq nice-all-RT-tasks is broken

On 08/03/2017 17:57, Steven Rostedt wrote:
> On Wed, 8 Mar 2017 11:51:14 -0500
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> 
>> Hmm, that commit was added in 2.6.18, and you're right, a lot has
>> changed since then. Have you tried removing it and running it under
>> lockdep, and see if it triggers any warnings?
> 
> I did a little digging, and it appears that its the rt mutex wait lock
> that the comment was referring to. Today that spin lock is irq safe. I
> believe its safe to remove the BUG_ON(). Want me to send a patch?

Sure, go ahead ;)

Thanks,
Laurent.