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

From: Sudeep Holla
Date: Fri Jan 17 2014 - 09:22:34 EST


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@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> ---
> 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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