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authorThomas Gleixner <tglx@linutronix.de>2020-05-21 22:05:21 +0200
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 15:15:06 +0200
commit8a6bc4787f05d087fda8e11ead225c8830250703 (patch)
tree5aab6b426717e6c38df155531e2e1795ef2599e1 /kernel
parent9ee01e0f69a925b6ff7d5f39441413c55132b167 (diff)
genirq: Provide irq_enter/exit_rcu()
irq_enter()/exit() currently include RCU handling. To properly separate the RCU handling code, provide variants which contain only the non-RCU related functionality. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20200521202117.567023613@linutronix.de
Diffstat (limited to 'kernel')
-rw-r--r--kernel/softirq.c35
1 files changed, 27 insertions, 8 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index a47c6dd57452..beb8e3a66c7c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -339,12 +339,11 @@ asmlinkage __visible void do_softirq(void)
local_irq_restore(flags);
}
-/*
- * Enter an interrupt context.
+/**
+ * irq_enter_rcu - Enter an interrupt context with RCU watching
*/
-void irq_enter(void)
+void irq_enter_rcu(void)
{
- rcu_irq_enter();
if (is_idle_task(current) && !in_interrupt()) {
/*
* Prevent raise_softirq from needlessly waking up ksoftirqd
@@ -354,10 +353,18 @@ void irq_enter(void)
tick_irq_enter();
_local_bh_enable();
}
-
__irq_enter();
}
+/**
+ * irq_enter - Enter an interrupt context including RCU update
+ */
+void irq_enter(void)
+{
+ rcu_irq_enter();
+ irq_enter_rcu();
+}
+
static inline void invoke_softirq(void)
{
if (ksoftirqd_running(local_softirq_pending()))
@@ -397,10 +404,12 @@ static inline void tick_irq_exit(void)
#endif
}
-/*
- * Exit an interrupt context. Process softirqs if needed and possible:
+/**
+ * irq_exit_rcu() - Exit an interrupt context without updating RCU
+ *
+ * Also processes softirqs if needed and possible.
*/
-void irq_exit(void)
+void irq_exit_rcu(void)
{
#ifndef __ARCH_IRQ_EXIT_IRQS_DISABLED
local_irq_disable();
@@ -413,6 +422,16 @@ void irq_exit(void)
invoke_softirq();
tick_irq_exit();
+}
+
+/**
+ * irq_exit - Exit an interrupt context, update RCU and lockdep
+ *
+ * Also processes softirqs if needed and possible.
+ */
+void irq_exit(void)
+{
+ irq_exit_rcu();
rcu_irq_exit();
/* must be last! */
lockdep_hardirq_exit();