linux-kernel - Re: [RFC PATCH v2 1/9] arm: avoid using on_each

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Date:	Sun, 8 Jan 2012 16:12:12 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
Cc:	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [RFC PATCH v2 1/9] arm: avoid using on_each_cpu hard coded ret
	value

On Sun, Jan 08, 2012 at 03:32:21PM +0200, Gilad Ben-Yossef wrote:
> on_each_cpu always returns a hard coded return code of zero.
> 
> Removing all tests based on this return value saves run time
> cycles for compares and code bloat for branches.
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Reviewed-by: Michal Nazarewicz <mina86@...a86.com>
> CC: Will Deacon <will.deacon@....com>
> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> CC: Russell King <linux@....linux.org.uk>

Reviewed-by: Russell King <rmk+kernel@....linux.org.uk>

> CC: Grant Likely <grant.likely@...retlab.ca>
> CC: Rob Herring <rob.herring@...xeda.com>
> CC: linux-arm-kernel@...ts.infradead.org
> CC: devicetree-discuss@...ts.ozlabs.org
> ---
>  arch/arm/kernel/perf_event.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
> index 5bb91bf..6e9acb7 100644
> --- a/arch/arm/kernel/perf_event.c
> +++ b/arch/arm/kernel/perf_event.c
> @@ -616,7 +616,7 @@ static int __init
>  cpu_pmu_reset(void)
>  {
>  	if (cpu_pmu && cpu_pmu->reset)
> -		return on_each_cpu(cpu_pmu->reset, NULL, 1);
> +		on_each_cpu(cpu_pmu->reset, NULL, 1);

There's not much to review here...

Thanks.

>  	return 0;
>  }
>  arch_initcall(cpu_pmu_reset);
> -- 
> 1.7.0.4
> 
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