linux-kernel - Re: [patch 10/12] hrtimer: Determine hard/soft expiry mode for hrtimer sleepers on RT

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Date:   Fri, 26 Jul 2019 16:56:49 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [patch 10/12] hrtimer: Determine hard/soft expiry mode for
 hrtimer sleepers on RT

On Fri, 26 Jul 2019 22:52:18 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:
> > Have we marked all timer handlers that have normal spin_locks as
> > HRTIMER_MODE_SOFT? Otherwise, can't we switch one to hard below and
> > having their handler grab a spin_lock/mutex in hard interrupt context
> > in RT?  
> 
> See patch 09/12. We move all timers into soft mode which are not marked
> MODE_HARD.
> 


> > >  	sl->timer.function = hrtimer_wakeup;  
> 
> It's the wakeup function and nothing is supposed to override that.

Ah, that makes sense. Not the actual handler then.

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve