rcu: Remove "extern" from function declaration in include/linux/rcupdate.h
Because functions have the extern storage class specifier by default, this keyword can be removed. It is redundant to use it explicitly. Signed-off-by: NIulia Manda <iulia.manda21@gmail.com> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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