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authorJosh Triplett <josh@joshtriplett.org>2011-12-04 01:06:50 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 22:32:20 +0400
commit2987557f52b97f679f0c324d8f51b8d66e1f2084 (patch)
tree93264730d265ef1987e45a97989d75b7a966dbab /include/linux/cpu.h
parent2d1dc9a600edf33321bcdc1c808b7957d8a3f3e1 (diff)
downloadlinux-2987557f52b97f679f0c324d8f51b8d66e1f2084.tar.xz
driver-core/cpu: Expose hotpluggability to the rest of the kernel
When architectures register CPUs, they indicate whether the CPU allows hotplugging; notably, x86 and ARM don't allow hotplugging CPU 0. Userspace can easily query the hotpluggability of a CPU via sysfs; however, the kernel has no convenient way of accessing that property in an architecture-independent way. While the kernel can simply try it and see, some code needs to distinguish between "hotplug failed" and "hotplug has no hope of working on this CPU"; for example, rcutorture's CPU hotplug tests want to avoid drowning out real hotplug failures with expected failures. Expose this property via a new cpu_is_hotpluggable function, so that the rest of the kernel can access it in an architecture-independent way. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/cpu.h')
-rw-r--r--include/linux/cpu.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 6cb60fd2ea84..305c263021e7 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -27,6 +27,7 @@ struct cpu {
extern int register_cpu(struct cpu *cpu, int num);
extern struct sys_device *get_cpu_sysdev(unsigned cpu);
+extern bool cpu_is_hotpluggable(unsigned cpu);
extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);