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fsmlabs的real time linux的内核

Hello world using mbuff to communicate data from non-rt user-space to 
a rt-thread

hello_shm.o	kernel module accessing a shared data structure via mbuff

user_shm	user-space app that writes to this shared data area, this
		app will only write a string to the shared area an exit,
		run dmesg to see if it arived at the rt-thread.