Paul E. McKenney 994f706872
srcu: Make Tree SRCU able to operate without snp_node array ...
This commit makes Tree SRCU able to operate without an snp_node
array, that is, when the srcu_data structures' ->mynode pointers
are NULL. This can result in high contention on the srcu_struct
structure's ->lock, but only when there are lots of call_srcu(),
synchronize_srcu(), and synchronize_srcu_expedited() calls.
Note that when there is no snp_node array, all SRCU callbacks use
CPU 0's callback queue. This is optimal in the common case of low
update-side load because it removes the need to search each CPU
for the single callback that made the grace period happen.
Co-developed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com >
Signed-off-by: Neeraj Upadhyay <quic_neeraju@quicinc.com >
Signed-off-by: Paul E. McKenney <paulmck@kernel.org >
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