linux-kernel - Re: [RFC][PATCH 5/7] jump_label: Rework update logic

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Message-ID: <20150727163005.GP18673@twins.programming.kicks-ass.net>
Date:	Mon, 27 Jul 2015 18:30:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	linux-kernel@...r.kernel.org, mingo@...nel.org
Cc:	jasonbaron0@...il.com, bp@...en8.de, luto@...capital.net,
	tglx@...utronix.de, rostedt@...dmis.org, will.deacon@....com,
	liuj97@...il.com, rabin@....in, ralf@...ux-mips.org,
	ddaney@...iumnetworks.com, benh@...nel.crashing.org,
	michael@...erman.id.au, heiko.carstens@...ibm.com,
	davem@...emloft.net
Subject: Re: [RFC][PATCH 5/7] jump_label: Rework update logic

On Mon, Jul 27, 2015 at 12:47:14PM +0200, Peter Zijlstra wrote:
> @@ -68,13 +63,8 @@ void static_key_slow_inc(struct static_k
>  		return;
>  
>  	jump_label_lock();
> +	if (atomic_inc_and_test(&key->enabled))

atomic_inc_return() == 1, works _much_ better.

> +		jump_label_update(key);
>  	jump_label_unlock();
>  }
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