linux-kernel - Re: [PATCH 8/8] ARM: smp: Remove local timer API

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Date:	Tue, 05 Mar 2013 10:45:11 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mark Rutland <mark.rutland@....com>
CC:	Paul Mundt <lethal@...ux-sh.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] ARM: smp: Remove local timer API

On 03/05/13 03:02, Mark Rutland wrote:
>
>>> +
>>> +static void dummy_set_mode(enum clock_event_mode mode,
>>> +			   struct clock_event_device *evt)
>>> +{
>>> +	/*
>>> +	 * Core clockevents code will call this when exchanging timer devices.
>>> +	 * We don't need to do anything here.
>>> +	 */
>>> +}
>>> +
>>> +static void __cpuinit dummy_setup(void)
>>> +{
>>> +	int cpu = smp_processor_id();
>>> +	struct clock_event_device *evt = &per_cpu(dummy_evt, cpu);
>> Can we use __this_cpu_ptr()? I wonder if that makes the code generation
>> better or worse. I didn't do it in my 8/8 patch because I wanted the
>> code to be the same before and after to show code movement.
> I did that originally, but thought as I needed the cpu value for the mask
> anyway that there wasn't much point. I'm not that good at reading generated
> assembly, so I can't really say if either's better.

It looks to be two instructions shorter.

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