The Hyper-V balloon driver does memory hot-add. The device_hotplug_lock is designed to address AB BA deadlock issues between the hot-add path and the sysfs path. Export the APIs to acquire and release the device_hotplug_lock for use by loadable modules that want to hot-add memory or CPU.
Signed-off-by: K. Y. Srinivasan <[email protected]> --- drivers/base/core.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 97e2baf..b3073af 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -55,11 +55,13 @@ void lock_device_hotplug(void) { mutex_lock(&device_hotplug_lock); } +EXPORT_SYMBOL_GPL(lock_device_hotplug); void unlock_device_hotplug(void) { mutex_unlock(&device_hotplug_lock); } +EXPORT_SYMBOL_GPL(unlock_device_hotplug); int lock_device_hotplug_sysfs(void) { -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
