check latest kernel buildin kernel interrupt: https://www.cnblogs.com/aaronLinux/p/6341590.html timer: https://blog.csdn.net/njuitjf/article/details/108454786 locks: thread: BH context GFP_KERNEL/GFP_ATOMIC: spin_lock/spin_lock_bh rcu_read/write_lock RCU_INIT_POINTER()/rcu_access_pointer red-black tree..