linux-kernel - Re: [PATCH 07/14] [POWERPC] Populate cpu_enabled

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Date:	Tue, 15 Jul 2008 15:51:35 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alex Chiang <achiang@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-acpi@...r.kernel.org, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 07/14] [POWERPC] Populate cpu_enabled_map

On Mon, 2008-07-14 at 20:34 -0600, Alex Chiang wrote:
> Populate the cpu_enabled_map correctly.
> 
> Note that this patch does not actually make any decisions based
> on the contents of the map.
> 
> However, as the map is presented via sysfs in:
> 
> 	/sys/devices/system/cpu/
> 
> It should be populated correctly.

Care to educate me on the difference between online_map and
enabled_map ?

Cheers,
Ben.

> Signed-off-by: Alex Chiang <achiang@...com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
> 
>  arch/powerpc/kernel/setup-common.c           |    1 +
>  arch/powerpc/platforms/powermac/smp.c        |    1 +
>  arch/powerpc/platforms/pseries/hotplug-cpu.c |    2 ++
>  3 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
> index db540ea..a4c894a 100644
> --- a/arch/powerpc/kernel/setup-common.c
> +++ b/arch/powerpc/kernel/setup-common.c
> @@ -413,6 +413,7 @@ void __init smp_setup_cpu_maps(void)
>  			DBG("    thread %d -> cpu %d (hard id %d)\n",
>  			    j, cpu, intserv[j]);
>  			cpu_set(cpu, cpu_present_map);
> +			cpu_set(cpu, cpu_enabled_map);
>  			set_hard_smp_processor_id(cpu, intserv[j]);
>  			cpu_set(cpu, cpu_possible_map);
>  			cpu++;
> diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
> index cb2d894..a74dada 100644
> --- a/arch/powerpc/platforms/powermac/smp.c
> +++ b/arch/powerpc/platforms/powermac/smp.c
> @@ -317,6 +317,7 @@ static int __init smp_psurge_probe(void)
>  		ncpus = NR_CPUS;
>  	for (i = 1; i < ncpus ; ++i) {
>  		cpu_set(i, cpu_present_map);
> +		cpu_set(i, cpu_enabled_map);
>  		set_hard_smp_processor_id(i, i);
>  	}
>  
> diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
> index 1f03248..e738b07 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
> @@ -186,6 +186,7 @@ static int pseries_add_processor(struct device_node *np)
>  	for_each_cpu_mask(cpu, tmp) {
>  		BUG_ON(cpu_isset(cpu, cpu_present_map));
>  		cpu_set(cpu, cpu_present_map);
> +		cpu_set(cpu, cpu_enabled_map);
>  		set_hard_smp_processor_id(cpu, *intserv++);
>  	}
>  	err = 0;
> @@ -218,6 +219,7 @@ static void pseries_remove_processor(struct device_node *np)
>  				continue;
>  			BUG_ON(cpu_online(cpu));
>  			cpu_clear(cpu, cpu_present_map);
> +			cpu_clear(cpu, cpu_enabled_map);
>  			set_hard_smp_processor_id(cpu, -1);
>  			break;
>  		}

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