linux-kernel - Re: [PATCH v3 04/20] lockdep: Add preemption enabled/disabled assertion APIs

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Date:   Mon, 6 Jul 2020 22:50:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Ahmed S. Darwish" <a.darwish@...utronix.de>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Sebastian A. Siewior" <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 04/20] lockdep: Add preemption enabled/disabled
 assertion APIs

On Tue, Jun 30, 2020 at 07:44:36AM +0200, Ahmed S. Darwish wrote:
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index d74ac0fd6b2d..e5e2e632b749 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1118,6 +1118,7 @@ config PROVE_LOCKING
>  	select DEBUG_RWSEMS
>  	select DEBUG_WW_MUTEX_SLOWPATH
>  	select DEBUG_LOCK_ALLOC
> +	select PREEMPT_COUNT if !ARCH_NO_PREEMPT
>  	select TRACE_IRQFLAGS
>  	default n
>  	help

I suspect this can be done unconditional, the thing that requires arch
support is CONFIG_PREEMPTION.