genirq: Remove IRQ_MOVE_PCNTXT and related code

Now that x86 is converted over to use the IRQCHIP_MOVE_DEFERRED flags,
remove IRQ*_MOVE_PCNTXT and related code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241210103335.626707225@linutronix.de

Author: KAGA-KOKO

arch/x86/Kconfig

@@ -173,7 +173,6 @@ config X86
 	select GENERIC_IRQ_RESERVATION_MODE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_PENDING_IRQ		if SMP
-	select GENERIC_PENDING_IRQ_CHIPFLAGS	if SMP
 	select GENERIC_PTDUMP
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL

include/linux/irq.h

@@ -64,7 +64,6 @@ enum irqchip_irq_state;
  * IRQ_NOAUTOEN			- Interrupt is not automatically enabled in
  *				  request/setup_irq()
  * IRQ_NO_BALANCING		- Interrupt cannot be balanced (affinity set)
- * IRQ_MOVE_PCNTXT		- Interrupt can be migrated from process context
  * IRQ_NESTED_THREAD		- Interrupt nests into another thread
  * IRQ_PER_CPU_DEVID		- Dev_id is a per-cpu variable
  * IRQ_IS_POLLED		- Always polled by another interrupt. Exclude
@@ -93,7 +92,6 @@ enum {
 	IRQ_NOREQUEST		= (1 << 11),
 	IRQ_NOAUTOEN		= (1 << 12),
 	IRQ_NO_BALANCING	= (1 << 13),
-	IRQ_MOVE_PCNTXT		= (1 << 14),
 	IRQ_NESTED_THREAD	= (1 << 15),
 	IRQ_NOTHREAD		= (1 << 16),
 	IRQ_PER_CPU_DEVID	= (1 << 17),
@@ -105,7 +103,7 @@ enum {
 
 #define IRQF_MODIFY_MASK	\
 	(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
-	 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
+	 IRQ_NOAUTOEN | IRQ_LEVEL | IRQ_NO_BALANCING | \
 	 IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
 	 IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_HIDDEN)
 
@@ -201,8 +199,6 @@ struct irq_data {
  * IRQD_LEVEL			- Interrupt is level triggered
  * IRQD_WAKEUP_STATE		- Interrupt is configured for wakeup
  *				  from suspend
- * IRQD_MOVE_PCNTXT		- Interrupt can be moved in process
- *				  context
  * IRQD_IRQ_DISABLED		- Disabled state of the interrupt
  * IRQD_IRQ_MASKED		- Masked state of the interrupt
  * IRQD_IRQ_INPROGRESS		- In progress state of the interrupt
@@ -233,7 +229,6 @@ enum {
 	IRQD_AFFINITY_SET		= BIT(12),
 	IRQD_LEVEL			= BIT(13),
 	IRQD_WAKEUP_STATE		= BIT(14),
-	IRQD_MOVE_PCNTXT		= BIT(15),
 	IRQD_IRQ_DISABLED		= BIT(16),
 	IRQD_IRQ_MASKED			= BIT(17),
 	IRQD_IRQ_INPROGRESS		= BIT(18),
@@ -338,11 +333,6 @@ static inline bool irqd_is_wakeup_set(struct irq_data *d)
 	return __irqd_to_state(d) & IRQD_WAKEUP_STATE;
 }
 
-static inline bool irqd_can_move_in_process_context(struct irq_data *d)
-{
-	return __irqd_to_state(d) & IRQD_MOVE_PCNTXT;
-}
-
 static inline bool irqd_irq_disabled(struct irq_data *d)
 {
 	return __irqd_to_state(d) & IRQD_IRQ_DISABLED;

kernel/irq/chip.c

@@ -47,13 +47,6 @@ int irq_set_chip(unsigned int irq, const struct irq_chip *chip)
 		return -EINVAL;
 
 	desc->irq_data.chip = (struct irq_chip *)(chip ?: &no_irq_chip);
-
-	if (IS_ENABLED(CONFIG_GENERIC_PENDING_IRQ_CHIPFLAGS) && chip) {
-		if (chip->flags & IRQCHIP_MOVE_DEFERRED)
-			irqd_clear(&desc->irq_data, IRQD_MOVE_PCNTXT);
-		else
-			irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
-	}
 	irq_put_desc_unlock(desc, flags);
 	/*
 	 * For !CONFIG_SPARSE_IRQ make the irq show up in
@@ -1129,13 +1122,6 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 	if (irq_settings_is_level(desc))
 		irqd_set(&desc->irq_data, IRQD_LEVEL);
 
-	/* Keep this around until x86 is converted over */
-	if (!IS_ENABLED(CONFIG_GENERIC_PENDING_IRQ_CHIPFLAGS)) {
-		irqd_clear(&desc->irq_data, IRQD_MOVE_PCNTXT);
-		if (irq_settings_can_move_pcntxt(desc))
-			irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
-	}
-
 	tmp = irq_settings_get_trigger_mask(desc);
 	if (tmp != IRQ_TYPE_NONE)
 		trigger = tmp;

kernel/irq/debugfs.c

@@ -109,7 +109,6 @@ static const struct irq_bit_descr irqdata_states[] = {
 	BIT_MASK_DESCR(IRQD_NO_BALANCING),
 
 	BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
-	BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
 	BIT_MASK_DESCR(IRQD_AFFINITY_SET),
 	BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
 	BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),

kernel/irq/internals.h

@@ -421,7 +421,7 @@ irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 #ifdef CONFIG_GENERIC_PENDING_IRQ
 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 {
-	return irqd_can_move_in_process_context(data);
+	return !(data->chip->flags & IRQCHIP_MOVE_DEFERRED);
 }
 static inline bool irq_move_pending(struct irq_data *data)
 {

kernel/irq/settings.h

@@ -11,7 +11,6 @@ enum {
 	_IRQ_NOREQUEST		= IRQ_NOREQUEST,
 	_IRQ_NOTHREAD		= IRQ_NOTHREAD,
 	_IRQ_NOAUTOEN		= IRQ_NOAUTOEN,
-	_IRQ_MOVE_PCNTXT	= IRQ_MOVE_PCNTXT,
 	_IRQ_NO_BALANCING	= IRQ_NO_BALANCING,
 	_IRQ_NESTED_THREAD	= IRQ_NESTED_THREAD,
 	_IRQ_PER_CPU_DEVID	= IRQ_PER_CPU_DEVID,
@@ -142,11 +141,6 @@ static inline void irq_settings_set_noprobe(struct irq_desc *desc)
 	desc->status_use_accessors |= _IRQ_NOPROBE;
 }
 
-static inline bool irq_settings_can_move_pcntxt(struct irq_desc *desc)
-{
-	return desc->status_use_accessors & _IRQ_MOVE_PCNTXT;
-}
-
 static inline bool irq_settings_can_autoenable(struct irq_desc *desc)
 {
 	return !(desc->status_use_accessors & _IRQ_NOAUTOEN);