Messages in this thread Patch in this message | | | Date | Wed, 8 Nov 2006 17:27:32 -0800 | From | "Siddha, Suresh B" <> | Subject | [patch 2/4] i386: introduce the mechanism of disabling cpu hotplug control |
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Add 'enable_cpu_hotplug' flag and when cleared, the hotplug control file ("online") will not be added under /sys/devices/system/cpu/cpuX/
Next patch doing PCI quirks will use this.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> ---
diff --git a/arch/i386/kernel/topology.c b/arch/i386/kernel/topology.c index 07d6da3..844c08f 100644 --- a/arch/i386/kernel/topology.c +++ b/arch/i386/kernel/topology.c @@ -40,14 +40,18 @@ int arch_register_cpu(int num) * restrictions and assumptions in kernel. This basically * doesnt add a control file, one cannot attempt to offline * BSP. + * + * Also certain PCI quirks require not to enable hotplug control + * for all CPU's. */ - if (!num) + if (!num || !enable_cpu_hotplug) cpu_devices[num].cpu.no_control = 1; return register_cpu(&cpu_devices[num].cpu, num); } #ifdef CONFIG_HOTPLUG_CPU +int enable_cpu_hotplug = 1; void arch_unregister_cpu(int num) { return unregister_cpu(&cpu_devices[num].cpu); diff --git a/include/asm-i386/cpu.h b/include/asm-i386/cpu.h index b1bc7b1..9d914e1 100644 --- a/include/asm-i386/cpu.h +++ b/include/asm-i386/cpu.h @@ -13,6 +13,9 @@ struct i386_cpu { extern int arch_register_cpu(int num); #ifdef CONFIG_HOTPLUG_CPU extern void arch_unregister_cpu(int); +extern int enable_cpu_hotplug; +#else +#define enable_cpu_hotplug 0 #endif DECLARE_PER_CPU(int, cpu_state); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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