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The synchronize_rcu_expedited() and synchronize_sched_expedited() expedited-grace-period primitives induce OS jitter, which can degrade real-time response. This commit therefore adds a checkpatch.pl warning on any patch adding them. Note that this patch does not warn on synchronize_srcu_expedited() because it does not induce OS jitter, courtesy of its otherwise much-maligned read-side memory barriers. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Joe Perches <joe@perches.com>