Merge branch irq/irq_cpu_offline into irq/irqchip-next

* irq/irq_cpu_offline:
  : .
  : Make irq_cpu_{on,off}line() deprecated kernel API, and only
  : enable it for some obscure Cavium platform after having
  : moved all the other users away from it.
  :
  : Next step, drop the platform itself.
  : .
  genirq: Hide irq_cpu_{on,off}line() behind a deprecated option
  irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()
  MIPS: loongson64: Drop call to irq_cpu_offline()

Signed-off-by: Marc Zyngier <maz@kernel.org>

arch/mips/loongson64/smp.c

@@ -550,7 +550,6 @@ static int loongson3_cpu_disable(void)
 	set_cpu_online(cpu, false);
 	calculate_cpu_foreign_map();
 	local_irq_save(flags);
-	irq_cpu_offline();
 	clear_c0_status(ST0_IM);
 	local_irq_restore(flags);
 	local_flush_tlb_all();

drivers/irqchip/irq-mips-gic.c

@@ -381,24 +381,35 @@ static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
 	spin_unlock_irqrestore(&gic_lock, flags);
 }
 
-static void gic_all_vpes_irq_cpu_online(struct irq_data *d)
+static void gic_all_vpes_irq_cpu_online(void)
 {
-	struct gic_all_vpes_chip_data *cd;
-	unsigned int intr;
+	static const unsigned int local_intrs[] = {
+		GIC_LOCAL_INT_TIMER,
+		GIC_LOCAL_INT_PERFCTR,
+		GIC_LOCAL_INT_FDC,
+	};
+	unsigned long flags;
+	int i;
 
-	intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
-	cd = irq_data_get_irq_chip_data(d);
+	spin_lock_irqsave(&gic_lock, flags);
 
-	write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
-	if (cd->mask)
-		write_gic_vl_smask(BIT(intr));
+	for (i = 0; i < ARRAY_SIZE(local_intrs); i++) {
+		unsigned int intr = local_intrs[i];
+		struct gic_all_vpes_chip_data *cd;
+
+		cd = &gic_all_vpes_chip_data[intr];
+		write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
+		if (cd->mask)
+			write_gic_vl_smask(BIT(intr));
+	}
+
+	spin_unlock_irqrestore(&gic_lock, flags);
 }
 
 static struct irq_chip gic_all_vpes_local_irq_controller = {
 	.name			= "MIPS GIC Local",
 	.irq_mask		= gic_mask_local_irq_all_vpes,
 	.irq_unmask		= gic_unmask_local_irq_all_vpes,
-	.irq_cpu_online		= gic_all_vpes_irq_cpu_online,
 };
 
 static void __gic_irq_dispatch(void)
@@ -477,6 +488,10 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
 	intr = GIC_HWIRQ_TO_LOCAL(hwirq);
 	map = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin;
 
+	/*
+	 * If adding support for more per-cpu interrupts, keep the the
+	 * array in gic_all_vpes_irq_cpu_online() in sync.
+	 */
 	switch (intr) {
 	case GIC_LOCAL_INT_TIMER:
 		/* CONFIG_MIPS_CMP workaround (see __gic_init) */
@@ -663,8 +678,8 @@ static int gic_cpu_startup(unsigned int cpu)
 	/* Clear all local IRQ masks (ie. disable all local interrupts) */
 	write_gic_vl_rmask(~0);
 
-	/* Invoke irq_cpu_online callbacks to enable desired interrupts */
-	irq_cpu_online();
+	/* Enable desired interrupts */
+	gic_all_vpes_irq_cpu_online();
 
 	return 0;
 }

include/linux/irq.h

@@ -524,9 +524,10 @@ struct irq_chip {
 	void		(*irq_bus_lock)(struct irq_data *data);
 	void		(*irq_bus_sync_unlock)(struct irq_data *data);
 
+#ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
 	void		(*irq_cpu_online)(struct irq_data *data);
 	void		(*irq_cpu_offline)(struct irq_data *data);
-
+#endif
 	void		(*irq_suspend)(struct irq_data *data);
 	void		(*irq_resume)(struct irq_data *data);
 	void		(*irq_pm_shutdown)(struct irq_data *data);
@@ -606,8 +607,10 @@ struct irqaction;
 extern int setup_percpu_irq(unsigned int irq, struct irqaction *new);
 extern void remove_percpu_irq(unsigned int irq, struct irqaction *act);
 
+#ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
 extern void irq_cpu_online(void);
 extern void irq_cpu_offline(void);
+#endif
 extern int irq_set_affinity_locked(struct irq_data *data,
 				   const struct cpumask *cpumask, bool force);
 extern int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info);

kernel/irq/Kconfig

@@ -141,3 +141,10 @@ config GENERIC_IRQ_MULTI_HANDLER
 	bool
 	help
 	  Allow to specify the low level IRQ handler at run time.
+
+# Cavium Octeon is the last system to use this deprecated option
+# Do not even think of enabling this on any new platform
+config DEPRECATED_IRQ_CPU_ONOFFLINE
+	bool
+	depends on CAVIUM_OCTEON_SOC
+	default CAVIUM_OCTEON_SOC

kernel/irq/chip.c

@@ -1122,6 +1122,7 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
 }
 EXPORT_SYMBOL_GPL(irq_modify_status);
 
+#ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
 /**
  *	irq_cpu_online - Invoke all irq_cpu_online functions.
  *
@@ -1181,6 +1182,7 @@ void irq_cpu_offline(void)
 		raw_spin_unlock_irqrestore(&desc->lock, flags);
 	}
 }
+#endif
 
 #ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY