linux-kernel - Re: [PATCH 2/9] ARM64: get rid of arch_cpu_idle

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Date:	Mon, 27 Jan 2014 09:23:47 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	linux-pm@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 2/9] ARM64: get rid of arch_cpu_idle_prepare()

On 01/27/2014 07:08 AM, Nicolas Pitre wrote:
> ARM and ARM64 are the only two architectures implementing
> arch_cpu_idle_prepare() simply to call local_fiq_enable().
>
> We have secondary_start_kernel() already calling local_fiq_enable() and
> this is done a second time in arch_cpu_idle_prepare() in that case. And
> enabling FIQs has nothing to do with idling the CPU to start with.
>
> So let's introduce init_fiq_boot_cpu() to take care of FIQs on the boot
> CPU and remove arch_cpu_idle_prepare(). This is now done a bit earlier
> at late_initcall time but this shouldn't make a difference in practice
> given that FIQs are not currently used on ARM64.
>
> Signed-off-by: Nicolas Pitre <nico@...aro.org>

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>   arch/arm64/kernel/process.c | 5 -----
>   arch/arm64/kernel/setup.c   | 7 +++++++
>   2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index de17c89985..f6c733da67 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -84,11 +84,6 @@ EXPORT_SYMBOL_GPL(pm_power_off);
>   void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
>   EXPORT_SYMBOL_GPL(arm_pm_restart);
>
> -void arch_cpu_idle_prepare(void)
> -{
> -	local_fiq_enable();
> -}
> -
>   /*
>    * This is our default idle handler.
>    */
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index bd9bbd0e44..259557983a 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -255,6 +255,13 @@ static int __init arm64_device_init(void)
>   }
>   arch_initcall(arm64_device_init);
>
> +static int __init init_fiq_boot_cpu(void)
> +{
> +	local_fiq_enable();
> +	return 0;
> +}
> +late_initcall(init_fiq_boot_cpu);
> +
>   static DEFINE_PER_CPU(struct cpu, cpu_data);
>
>   static int __init topology_init(void)
>


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