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rcu: Make PREEMPT_RCU be a modifier to TREE_RCU

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Currently PREEMPT_RCU and TREE_RCU are mutually exclusive Kconfig
options.  But PREEMPT_RCU actually specifies a kind of TREE_RCU,
namely a preemptible TREE_RCU. This commit therefore makes PREEMPT_RCU
be a modifer to the TREE_RCU Kconfig option.  This has the benefit of
simplifying several of the #if expressions that formerly needed to
check both, but now need only check one or the other.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Lai Jiangshan 2019-10-15 02:55:57 +00:00 • committed by Paul E. McKenney
parent 03bd2983d7
commit b3e627d3d5
7 changed files with 14 additions and 14 deletions
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2
kernel/sysctl.c
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@ -1268,7 +1268,7 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_do_static_key,
},
#endif
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
#if defined(CONFIG_TREE_RCU)
{
.procname = "panic_on_rcu_stall",
.data = &sysctl_panic_on_rcu_stall,