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srcu: Introduce CLASSIC_SRCU Kconfig option

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The TREE_SRCU rewrite is large and a bit on the non-simple side, so
this commit helps reduce risk by allowing the old v4.11 SRCU algorithm
to be selected using a new CLASSIC_SRCU Kconfig option that depends
on RCU_EXPERT.  The default is to use the new TREE_SRCU and TINY_SRCU
algorithms, in order to help get these the testing that they need.
However, if your users do not require the update-side scalability that
is to be provided by TREE_SRCU, select RCU_EXPERT and then CLASSIC_SRCU
to revert back to the old classic SRCU algorithm.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-03-25 17:23:44 -07:00
parent 32071141b2
commit dad81a2026
7 changed files with 934 additions and 155 deletions
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2
kernel/rcu/rcutorture.c
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@@ -562,7 +562,7 @@ static void srcu_torture_stats(void)
int __maybe_unused cpu;
int idx;
#ifdef CONFIG_TREE_SRCU
#if defined(CONFIG_TREE_SRCU) || defined(CONFIG_CLASSIC_SRCU)
idx = srcu_ctlp->completed & 0x1;
pr_alert("%s%s Tree SRCU per-CPU(idx=%d):",
torture_type, TORTURE_FLAG, idx);