linux-kernel - Re: [PATCH 02/20] ARM64 : Add dummy asm/cpu.h

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Date:	Fri, 17 Jan 2014 14:22:34 +0000
From:	Sudeep Holla <Sudeep.Holla@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Sudeep.Holla@....com,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>
Subject: Re: [PATCH 02/20] ARM64 : Add dummy asm/cpu.h

On 17/01/14 12:24, Hanjun Guo wrote:
> ACPI requires a cpu.h, add a dummy one copied from arm. This will need
> updated or replaced as ACPI based cpu hotplug or cpu topology for armv8
> is worked out.
> 
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  arch/arm64/include/asm/cpu.h |   25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>  create mode 100644 arch/arm64/include/asm/cpu.h
> 
> diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
> new file mode 100644
> index 0000000..8625eb1
> --- /dev/null
> +++ b/arch/arm64/include/asm/cpu.h
> @@ -0,0 +1,25 @@
> +/*
> + *  Copyright (C) 2004-2005 ARM Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#ifndef __ASM_ARM_CPU_H
> +#define __ASM_ARM_CPU_H
> +
> +#include <linux/percpu.h>
> +#include <linux/cpu.h>
> +#include <linux/topology.h>
> +
> +struct cpuinfo_arm {
> +	struct cpu	cpu;
> +	u64		cpuid;
> +#ifdef CONFIG_SMP
> +	unsigned int	loops_per_jiffy;

IIUC we don't have loop-based delay support in ARM64.
It's always timer based and in which case we don't need loops_per_jiffy

Regards,
Sudeep


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