linux-kernel - Re: [PATCH 2/6] lockdep: Change hardirq{s_enabled,

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Message-ID: <20200527173918.GD706495@hirez.programming.kicks-ass.net>
Date:   Wed, 27 May 2020 19:39:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, will@...nel.org, tglx@...utronix.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        a.darwish@...utronix.de, rostedt@...dmis.org, bigeasy@...utronix.de
Subject: Re: [PATCH 2/6] lockdep: Change hardirq{s_enabled,_context} to
 per-cpu variables

On Wed, May 27, 2020 at 05:45:29PM +0200, Peter Zijlstra wrote:
> -do {						\
> -	if (!current->hardirq_context++)	\
> -		current->hardirq_threaded = 0;	\
> +# define lockdep_hardirq_enter()			\
> +do {							\
> +	if (!this_cpu_inc_return(hardirq_context))	\

	this_cpu_inc_return(hardirq_context) == 1

or this_cpu_fetch_inc(), which we don't have.

> +		current->hardirq_threaded = 0;		\