linux-kernel - Re: [PATCH 6/7] sched, x86: Provide a per-cpu preempt

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Message-ID: <20130910132724.GF31370@twins.programming.kicks-ass.net>
Date:	Tue, 10 Sep 2013 15:27:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Andi Kleen <ak@...ux.intel.com>, Peter Anvin <hpa@...or.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 6/7] sched, x86: Provide a per-cpu preempt_count
 implementation

On Tue, Sep 10, 2013 at 03:08:17PM +0200, Peter Zijlstra wrote:
> @@ -1095,6 +1095,9 @@ DEFINE_PER_CPU(char *, irq_stack_ptr) =
>  
>  DEFINE_PER_CPU(unsigned int, irq_count) __visible = -1;
>  
> +DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;
> +EXPORT_PER_CPU_SYMBOL(__preempt_count);
> +

Note that afaict this patch takes away the reason irq_count exists.
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