4.19.59-rt24-rc1 stable review patch. If anyone has any objections, please let me know.
------------------ From: Sebastian Andrzej Siewior <bige...@linutronix.de> [ Upstream commit c6c058c10577815a2491ce661876cff00a4c3b15 ] On RT rcu_normal_after_boot is enabled by default. Don't allow to disable it on RT because the "expedited rcu" would introduce latency spikes. Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de> Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org> --- kernel/rcu/update.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 16d8dba23329..ed75addd3ccd 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -69,7 +69,9 @@ module_param(rcu_expedited, int, 0); extern int rcu_normal; /* from sysctl */ module_param(rcu_normal, int, 0); static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); +#ifndef CONFIG_PREEMPT_RT_FULL module_param(rcu_normal_after_boot, int, 0); +#endif #endif /* #ifndef CONFIG_TINY_RCU */ #ifdef CONFIG_DEBUG_LOCK_ALLOC -- 2.20.1
