From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 6/7] sched, x86: Provide a per-cpu preempt_count
 implementation
Date: Tue, 10 Sep 2013 15:27:24 +0200
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References: <20130910130811.507933095@infradead.org>
 <20130910132011.396291123@infradead.org>
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To: Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>, Peter Anvin <hpa@zytor.com>, Mike Galbraith <bitbucket@online.de>, Thomas Gleixner <tglx@linutronix.de>, Arjan van de Ven <arjan@linux.intel.com>, Frederic Weisbecker <fweisbec@gmail.com>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org

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.