AcoSail/kernel_optimize_test
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[PATCH] 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>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Siddha, Suresh B 2006-12-07 02:14:10 +01:00 committed by Andi Kleen
parent 274e1bbdee
commit fd6d7d2689
2 changed files with 8 additions and 1 deletions
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6
arch/i386/kernel/topology.c
View File

@ -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);

3
include/asm-i386/cpu.h
View File

@ -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);