[PATCH v4 04/11] genirq: Introduce common irq_force_complete_move() implementation

[Anup Patel <apatel@ventanamicro.com>]

The GENERIC_PENDING_IRQ requires an arch specific implementation
of irq_force_complete_move(). At the moment, only x86 implements
this but for RISC-V the irq_force_complete_move() is only needed
when RISC-V IMSIC driver is in use and not needed otherwise.

To address the above, introduce common weak implementation of
the irq_force_complete_move() which lets irqchip do the actual
irq_force_complete_move().

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 include/linux/irq.h    | 5 +++++
 kernel/irq/migration.c | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 8daa17f0107a..1884fa4ec9b5 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -486,6 +486,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
  * @ipi_send_mask:	send an IPI to destination cpus in cpumask
  * @irq_nmi_setup:	function called from core code before enabling an NMI
  * @irq_nmi_teardown:	function called from core code after disabling an NMI
+ * @irq_force_complete_move:	optional function to force complete pending irq move
  * @flags:		chip specific flags
  */
 struct irq_chip {
@@ -537,6 +538,10 @@ struct irq_chip {
 	int		(*irq_nmi_setup)(struct irq_data *data);
 	void		(*irq_nmi_teardown)(struct irq_data *data);
 
+#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
+	void		(*irq_force_complete_move)(struct irq_data *data);
+#endif
+
 	unsigned long	flags;
 };
 
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index eb150afd671f..2920024475a3 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -5,6 +5,15 @@
 
 #include "internals.h"
 
+void __weak irq_force_complete_move(struct irq_desc *desc)
+{
+	struct irq_data *d = irq_desc_get_irq_data(desc);
+	struct irq_chip *chip = irq_data_get_irq_chip(d);
+
+	if (chip && chip->irq_force_complete_move)
+		chip->irq_force_complete_move(d);
+}
+
 /**
  * irq_fixup_move_pending - Cleanup irq move pending from a dying CPU
  * @desc:		Interrupt descriptor to clean up
-- 
2.43.0