2020-04-21 20:13:52 +00:00
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From 29483b5cb7e491f38927246ae4b2838bc300f5e8 Mon Sep 17 00:00:00 2001
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2019-08-18 21:33:52 +00:00
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Mon, 24 Jun 2019 18:29:13 +0200
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2020-04-21 20:13:52 +00:00
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Subject: [PATCH 269/325] rcu: Don't allow to change rcu_normal_after_boot on
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2019-08-18 21:33:52 +00:00
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RT
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2020-04-21 20:13:52 +00:00
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.115-rt48.tar.xz
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2019-08-18 21:33:52 +00:00
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[ Upstream commit c6c058c10577815a2491ce661876cff00a4c3b15 ]
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On RT rcu_normal_after_boot is enabled by default.
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Don't allow to disable it on RT because the "expedited rcu" would
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introduce latency spikes.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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---
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kernel/rcu/update.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
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index 16d8dba23329..ed75addd3ccd 100644
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--- a/kernel/rcu/update.c
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+++ b/kernel/rcu/update.c
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@@ -69,7 +69,9 @@ module_param(rcu_expedited, int, 0);
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extern int rcu_normal; /* from sysctl */
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module_param(rcu_normal, int, 0);
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static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
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+#ifndef CONFIG_PREEMPT_RT_FULL
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module_param(rcu_normal_after_boot, int, 0);
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+#endif
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#endif /* #ifndef CONFIG_TINY_RCU */
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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2020-01-03 23:36:11 +00:00
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--
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2020-04-09 19:44:24 +00:00
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2.25.1
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2020-01-03 23:36:11 +00:00
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