linux-kernel - Re: [PATCH 05/10] nohz: New tick dependency mask

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Message-ID: <20150803124350.GH19282@twins.programming.kicks-ass.net>
Date:	Mon, 3 Aug 2015 14:43:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Ingo Molnar <mingo@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 05/10] nohz: New tick dependency mask

On Thu, Jul 23, 2015 at 06:42:10PM +0200, Frederic Weisbecker wrote:
> +unsigned long __tick_nohz_set_tick_dependency(enum tick_dependency_bit bit,
> +					      unsigned long *dep)
> +{
> +	unsigned long prev;
> +	unsigned long old = *dep;
> +	unsigned long mask = BIT_MASK(bit);
> +
> +	while ((prev = cmpxchg(dep, old, old | mask)) != old) {
> +		old = prev;
> +		cpu_relax();
> +	}
> +
> +	return prev;
> +}

That's typically called a fetch_or(). The function name, which is
entirely too long, also doesn't suggest a return value.
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