linux-kernel - Re: [PATCH] target: Use WARNON_NON_RT(!irqs

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Date:   Wed, 21 Mar 2018 15:01:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        linux-scsi@...r.kernel.org,
        Daniel Bristot de Oliveira <daniel@...stot.me>,
        "Luis Claudio R. Gonçalves" <lclaudio@...hat.com>,
        Clark Williams <williams@...hat.com>,
        target-devel@...r.kernel.org
Subject: Re: [PATCH] target: Use WARNON_NON_RT(!irqs_disabled())

On Wed, 21 Mar 2018 11:50:01 -0700
Christoph Hellwig <hch@...radead.org> wrote:

> On Wed, Mar 21, 2018 at 12:38:54PM -0300, Arnaldo Carvalho de Melo wrote:
> >  	assert_spin_locked(&cmd->t_state_lock);
> > -	WARN_ON_ONCE(!irqs_disabled());
> > +	WARN_ON_ONCE_NONRT(!irqs_disabled());  
> 
> I can't find where WARN_ON_ONCE_NONRT is defined.

It's only in the RT patch set. But that may be changing soon.

> 
> That being said I think we can just kill these asserts.  If we have irqs
> disabled spin_unlock_irq a few lines below should already warn.

I agree with Linus. This should just be some kind of
lockdep_assert_held_irqs_disabeld() or something like that.

-- Steve