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 <kys@xxxxxxxxxxxxx>
---
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
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