rcu: Use WRITE_ONCE in RCU_INIT_POINTER
For the paranoid amongst us GCC would be in its right to use byte stores to write our NULL value, tell it not to do that. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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