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

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Message-ID: <20170308115758.43b38bc7@gandalf.local.home>
Date:   Wed, 8 Mar 2017 11:57:58 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
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 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?

-- Steve