rcu: Add lockdep_assert_held() teeth to tree_plugin.h
Comments can be helpful, but assertions carry more force. This commit therefore adds lockdep_assert_held() and RCU_LOCKDEP_WARN() calls to enforce lock-held and interrupt-disabled preconditions. Reported-by: NPeter Zijlstra <peterz@infradead.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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