linux-kernel - Re: [patch 4/7] timer: Replace timer base by a cpu index

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Message-ID: <20150527120914.GZ3644@twins.programming.kicks-ass.net>
Date:	Wed, 27 May 2015 14:09:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	John Stultz <john.stultz@...aro.org>,
	Joonwoo Park <joonwoop@...eaurora.org>,
	Wenbo Wang <wenbo.wang@...blaze.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Badhri Jagan Sridharan <Badhri@...gle.com>
Subject: Re: [patch 4/7] timer: Replace timer base by a cpu index

On Wed, May 27, 2015 at 02:52:36PM +0530, Viresh Kumar wrote:
> > +		timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
> 
> Because 'cpu' is used only once in this routine, maybe we can use
> 'new_base->cpu' here and the line will still be exactly 80 columns
> long.
> 
> Not sure, but maybe we can create a inline helper for this operation
> as it is repeated at multiple places.

I suggested bitfields at some point I think. That gets the compiler to
generate those helpers for you.
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