1 files changed, 82 insertions, 0 deletions
diff --git a/include/linux/interrupt_rc.h b/include/linux/interrupt_rc.h
new file mode 100644
index 000000000000..b9a7f05ecf42
--- /dev/null
+++ b/include/linux/interrupt_rc.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_INTERRUPT_RC_H
+#define __LINUX_INTERRUPT_RC_H
+
+/*
+ * include/linux/interrupt_rc.h - refcounted local processor interrupt
+ * management.
+ *
+ * Since the implementation of this API currently depends on
+ * local_irq_save()/local_irq_restore(), we split this into its own header to
+ * make it easier to include without hitting circular header dependencies.
+ */
+
+#include <linux/irqflags.h>
+#include <linux/preempt.h>
+#include <linux/processor.h>
+#include <linux/smp.h>
+
+#ifndef MODULE
+/* Per-CPU interrupt disabling state for local_interrupt_{disable,enable}(). */
+DECLARE_PER_CPU(unsigned long, local_interrupt_disable_state);
+
+static __always_inline void __local_interrupt_disable(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	raw_cpu_write(local_interrupt_disable_state, flags);
+}
+
+static __always_inline void __local_interrupt_enable(void)
+{
+	unsigned long flags = raw_cpu_read(local_interrupt_disable_state);
+
+	local_irq_restore(flags);
+}
+
+#ifndef INSTANTIATE_EXPORTED_INTERRUPT_DISABLE
+static __always_inline void _local_interrupt_disable(void)
+{
+	__local_interrupt_disable();
+}
+
+static __always_inline void _local_interrupt_enable(void)
+{
+	__local_interrupt_enable();
+}
+#else
+extern void _local_interrupt_disable(void);
+extern void _local_interrupt_enable(void);
+#endif
+
+#else /* !MODULE */
+extern void _local_interrupt_disable(void);
+extern void _local_interrupt_enable(void);
+#endif /* !MODULE */
+
+static inline void local_interrupt_disable(void)
+{
+	int new_count;
+
+	WARN_ON_ONCE(in_nmi());
+
+	new_count = hardirq_disable_enter();
+
+	/* Interrupts can happen here, but it's OK, see __irq_exit_rcu(). */
+
+	if ((new_count & HARDIRQ_DISABLE_MASK) == HARDIRQ_DISABLE_OFFSET)
+		_local_interrupt_disable();
+}
+
+static inline void local_interrupt_enable(void)
+{
+	int new_count;
+
+	new_count = hardirq_disable_exit();
+
+	if ((new_count & HARDIRQ_DISABLE_MASK) == 0)
+		_local_interrupt_enable();
+}
+
+#endif /* !__LINUX_INTERRUPT_RC_H */