In the Linux kernel, the following vulnerability has been resolved: block: mark GFPNOIO around sysfs ->store() sysfs ->store is called with queue freezed, meantime we have several ->store() callbacks(updatenrrequests, wbt, scheduler) to allocate memory with GFPKERNEL which may run into direct reclaim code path, then potential deadlock can be caused. Fix the issue by marking NOIO around sysfs ->store()