From 2f529f9b558ca1c1bd74be7437a84e4711743404 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 01 Nov 2024 02:11:33 +0000
Subject: [PATCH] add xenomai
---
kernel/kernel/rcu/update.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/kernel/kernel/rcu/update.c b/kernel/kernel/rcu/update.c
index 849f0aa9..8e4b48b 100644
--- a/kernel/kernel/rcu/update.c
+++ b/kernel/kernel/rcu/update.c
@@ -99,6 +99,11 @@
*/
static bool rcu_read_lock_held_common(bool *ret)
{
+ if (irqs_pipelined() &&
+ (hard_irqs_disabled() || running_oob())) {
+ *ret = 1;
+ return true;
+ }
if (!debug_lockdep_rcu_enabled()) {
*ret = true;
return true;
@@ -209,6 +214,32 @@
#endif /* #ifndef CONFIG_TINY_RCU */
+#ifdef CONFIG_IRQ_PIPELINE
+
+/*
+ * Prepare for taking the RCU read lock when running out-of-band. Nop
+ * otherwise.
+ */
+void rcu_oob_prepare_lock(void)
+{
+ if (!on_pipeline_entry() && running_oob())
+ rcu_nmi_enter();
+}
+EXPORT_SYMBOL_GPL(rcu_oob_prepare_lock);
+
+/*
+ * Converse to rcu_oob_prepare_lock(), after dropping the RCU read
+ * lock.
+ */
+void rcu_oob_finish_lock(void)
+{
+ if (!on_pipeline_entry() && running_oob())
+ rcu_nmi_exit();
+}
+EXPORT_SYMBOL_GPL(rcu_oob_finish_lock);
+
+#endif /* CONFIG_IRQ_PIPELINE */
+
/*
* Test each non-SRCU synchronous grace-period wait API. This is
* useful just after a change in mode for these primitives, and
--
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