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

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Date:   Thu, 22 Mar 2018 10:47:01 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linux SCSI List <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 <target-devel@...r.kernel.org>
Subject: Re: [PATCH] target: Use WARNON_NON_RT(!irqs_disabled())

On Thu, 22 Mar 2018, Arnaldo Carvalho de Melo wrote:
> Em Wed, Mar 21, 2018 at 11:43:58AM -0700, Linus Torvalds escreveu:
> > [ Adding PeterZ to participants due to query about lockdep_assert() ]
> > 
> > On Wed, Mar 21, 2018 at 8:38 AM, Arnaldo Carvalho de Melo
> > <acme@...nel.org> wrote:
> > >
> > >         assert_spin_locked(&cmd->t_state_lock);
> > > -       WARN_ON_ONCE(!irqs_disabled());
> > > +       WARN_ON_ONCE_NONRT(!irqs_disabled());
> > 
> > Ugh.
> > 
> > Can't we just replace both of those with a lockdep annotation?
> 
> Huh, even better, when that feature gets finished (tglx said it was
> being developed, not there yet tho) it'll allow further reduction of the
> PREEMPT_RT_FULL patchkit.

That's the evil plan :)