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This commit moves the ->srcu_cb_mutex field from the srcu_struct structure to the srcu_usage structure to reduce the size of the former in order to improve cache locality. Suggested-by: Christoph Hellwig <hch@lst.de> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com> Tested-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>