[PATCH v1] ARM: rockchip: Add cpu hotplug support

[mark.rutland@arm.com (Mark Rutland)]

On Wed, Jul 16, 2014 at 07:39:08PM +0100, Romain Perier wrote:
> Hi all,
> 
> This patch adds support for cpu hotplug for rockchip SoCs. You can now 
> use kexec with rockchip compatible devices.
> That's my first patch to the kernel, so perhaps that there are missing 
> things (I am sorry if this is the case).
> 
> 
> Regards,
> Romain
> 
> From 6727523766e3711ab58b2276d2e60bee0f7b7ba8 Mon Sep 17 00:00:00 2001
> From: Romain Perier <romain.perier@gmail.com>
> Date: Tue, 15 Jul 2014 19:38:05 +0000
> Subject: [PATCH] Add cpu hotplug support

This needs a message and sign-off. Please read
Documentation/SubmittingPatches.

Use scripts/get_maintainer.pl to find out who to Cc.

> 
> ---
>  arch/arm/mach-rockchip/platsmp.c | 33 ++++++++++++++++++++++++++++++++-
>  1 file changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
> index 910835d..7cdcf5f 100644
> --- a/arch/arm/mach-rockchip/platsmp.c
> +++ b/arch/arm/mach-rockchip/platsmp.c
> @@ -21,6 +21,7 @@
>  #include <linux/of_address.h>
>  
>  #include <asm/cacheflush.h>
> +#include <asm/cp15.h>
>  #include <asm/smp_scu.h>
>  #include <asm/smp_plat.h>
>  #include <asm/mach/map.h>
> @@ -178,8 +179,38 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
>  		pmu_set_power_domain(0 + i, false);
>  }
>  
> +#ifdef CONFIG_HOTPLUG_CPU
> +static DECLARE_COMPLETION(cpu_died);
> +
> +static int rockchip_cpu_kill(unsigned int cpu)
> +{
> +	if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(1000))) {
> +		pr_err("CPU%d: didn't die correctly\n", cpu);
> +		return 0;
> +	}
> +	pmu_set_power_domain(0 + cpu, false);
> +	return 1;
> +}
> +
> +
> +static void rockchip_cpu_die(unsigned int cpu)
> +{
> +	complete(&cpu_died);
> +	flush_cache_louis();
> +
> +	v7_exit_coherency_flush(louis);

Two flushes?

> +
> +	while(1)
> +		cpu_do_idle();
> +}
> +#endif
> +
>  static struct smp_operations rockchip_smp_ops __initdata = {
>  	.smp_prepare_cpus	= rockchip_smp_prepare_cpus,
> -	.smp_boot_secondary	= rockchip_boot_secondary,
> +	.smp_boot_secondary	= rockchip_boot_secondary
> +#ifdef CONFIG_HOTPLUG_CPU
> +	, .cpu_kill		= rockchip_cpu_kill,
> +	.cpu_die		= rockchip_cpu_die

Just put commas on the end of all lines. It's perfectly valid to have a
trailing comma even when there are no other fields.

Thanks,
Mark.