[PATCH v2 7/8] IRQ: drop regs parameter from handler functions

[Jan Beulich <jbeulich@xxxxxxxx>]

It's simply not needed anymore. Note how Linux made this change many
years ago already, in 2.6.19 (late 2006, see [1]).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

[1] https://git.kernel.org/torvalds/c/7d12e780e003f93433d49ce78cfedf4b4c52adc5
---
v2: Arm build fixes.

--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -397,7 +397,7 @@ void gic_interrupt(struct cpu_user_regs
     } while (1);
 }
 
-static void maintenance_interrupt(int irq, void *dev_id, struct cpu_user_regs 
*regs)
+static void maintenance_interrupt(int irq, void *dev_id)
 {
     /*
      * This is a dummy interrupt handler.
--- a/xen/arch/arm/irq.c
+++ b/xen/arch/arm/irq.c
@@ -182,8 +182,7 @@ void irq_set_affinity(struct irq_desc *d
 }
 
 int request_irq(unsigned int irq, unsigned int irqflags,
-                void (*handler)(int irq, void *dev_id,
-                                struct cpu_user_regs *regs),
+                void (*handler)(int irq, void *dev_id),
                 const char *devname, void *dev_id)
 {
     struct irqaction *action;
@@ -276,7 +275,7 @@ void do_IRQ(struct cpu_user_regs *regs,
 
     do
     {
-        action->handler(irq, action->dev_id, regs);
+        action->handler(irq, action->dev_id);
         action = action->next;
     } while ( action );
 
--- a/xen/arch/arm/time.c
+++ b/xen/arch/arm/time.c
@@ -241,7 +241,7 @@ int reprogram_timer(s_time_t timeout)
 }
 
 /* Handle the firing timer */
-static void htimer_interrupt(int irq, void *dev_id, struct cpu_user_regs *regs)
+static void htimer_interrupt(int irq, void *dev_id)
 {
     if ( unlikely(!(READ_SYSREG(CNTHP_CTL_EL2) & CNTx_CTL_PENDING)) )
         return;
@@ -255,7 +255,7 @@ static void htimer_interrupt(int irq, vo
     WRITE_SYSREG(0, CNTHP_CTL_EL2);
 }
 
-static void vtimer_interrupt(int irq, void *dev_id, struct cpu_user_regs *regs)
+static void vtimer_interrupt(int irq, void *dev_id)
 {
     /*
      * Edge-triggered interrupts can be used for the virtual timer. Even
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -962,7 +962,7 @@ static int __init cf_check irq_ratelimit
 __initcall(irq_ratelimit_init);
 
 int __init request_irq(unsigned int irq, unsigned int irqflags,
-        void (*handler)(int irq, void *dev_id, struct cpu_user_regs *regs),
+        void (*handler)(int irq, void *dev_id),
         const char * devname, void *dev_id)
 {
     struct irqaction * action;
@@ -2009,7 +2009,7 @@ void do_IRQ(struct cpu_user_regs *regs)
         spin_unlock_irq(&desc->lock);
 
         tsc_in = tb_init_done ? get_cycles() : 0;
-        action->handler(irq, action->dev_id, regs);
+        action->handler(irq, action->dev_id);
         TRACE_3D(TRC_HW_IRQ_HANDLED, irq, tsc_in, get_cycles());
 
         spin_lock_irq(&desc->lock);
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -237,8 +237,7 @@ again:
     }
 }
 
-static void cf_check hpet_interrupt_handler(
-    int irq, void *data, struct cpu_user_regs *regs)
+static void cf_check hpet_interrupt_handler(int irq, void *data)
 {
     struct hpet_event_channel *ch = data;
 
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -198,8 +198,7 @@ static void smp_send_timer_broadcast_ipi
     }
 }
 
-static void cf_check timer_interrupt(
-    int irq, void *dev_id, struct cpu_user_regs *regs)
+static void cf_check timer_interrupt(int irq, void *dev_id)
 {
     ASSERT(local_irq_is_enabled());
 
--- a/xen/common/irq.c
+++ b/xen/common/irq.c
@@ -29,7 +29,7 @@ int init_one_irq_desc(struct irq_desc *d
     return err;
 }
 
-void cf_check no_action(int cpl, void *dev_id, struct cpu_user_regs *regs)
+void cf_check no_action(int cpl, void *dev_id)
 {
 }
 
--- a/xen/drivers/char/cadence-uart.c
+++ b/xen/drivers/char/cadence-uart.c
@@ -40,7 +40,7 @@ static struct cuart {
 #define cuart_read(uart, off)           readl((uart)->regs + (off))
 #define cuart_write(uart, off,val)      writel((val), (uart)->regs + (off))
 
-static void cuart_interrupt(int irq, void *data, struct cpu_user_regs *regs)
+static void cuart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct cuart *uart = port->uart;
--- a/xen/drivers/char/exynos4210-uart.c
+++ b/xen/drivers/char/exynos4210-uart.c
@@ -45,7 +45,7 @@ static struct exynos4210_uart {
 #define exynos4210_read(uart, off)          readl((uart)->regs + off)
 #define exynos4210_write(uart, off, val)    writel(val, (uart->regs) + off)
 
-static void exynos4210_uart_interrupt(int irq, void *data, struct 
cpu_user_regs *regs)
+static void exynos4210_uart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct exynos4210_uart *uart = port->uart;
--- a/xen/drivers/char/imx-lpuart.c
+++ b/xen/drivers/char/imx-lpuart.c
@@ -37,8 +37,7 @@ static struct imx_lpuart {
     struct vuart_info vuart;
 } imx8_com;
 
-static void imx_lpuart_interrupt(int irq, void *data,
-                                 struct cpu_user_regs *regs)
+static void imx_lpuart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct imx_lpuart *uart = port->uart;
--- a/xen/drivers/char/meson-uart.c
+++ b/xen/drivers/char/meson-uart.c
@@ -61,8 +61,7 @@ static struct meson_uart {
     struct vuart_info vuart;
 } meson_com;
 
-static void meson_uart_interrupt(int irq, void *data,
-                                 struct cpu_user_regs *regs)
+static void meson_uart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct meson_uart *uart = port->uart;
--- a/xen/drivers/char/mvebu-uart.c
+++ b/xen/drivers/char/mvebu-uart.c
@@ -67,8 +67,7 @@ static struct mvebu3700_uart {
 #define mvebu3700_read(uart, off)           readl((uart)->regs + (off))
 #define mvebu3700_write(uart, off, val)     writel(val, (uart)->regs + (off))
 
-static void mvebu3700_uart_interrupt(int irq, void *data,
-                                     struct cpu_user_regs *regs)
+static void mvebu3700_uart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct mvebu3700_uart *uart = port->uart;
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -175,8 +175,7 @@ static void handle_dw_usr_busy_quirk(str
     }
 }
 
-static void cf_check ns16550_interrupt(
-    int irq, void *dev_id, struct cpu_user_regs *regs)
+static void cf_check ns16550_interrupt(int irq, void *dev_id)
 {
     struct serial_port *port = dev_id;
     struct ns16550 *uart = port->uart;
--- a/xen/drivers/char/omap-uart.c
+++ b/xen/drivers/char/omap-uart.c
@@ -59,7 +59,7 @@ static struct omap_uart {
     struct vuart_info vuart;
 } omap_com = {0};
 
-static void omap_uart_interrupt(int irq, void *data, struct cpu_user_regs 
*regs)
+static void omap_uart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct omap_uart *uart = port->uart;
--- a/xen/drivers/char/pl011.c
+++ b/xen/drivers/char/pl011.c
@@ -82,7 +82,7 @@ static unsigned int pl011_intr_status(st
     return (pl011_read(uart, RIS) & pl011_read(uart, IMSC));
 }
 
-static void pl011_interrupt(int irq, void *data, struct cpu_user_regs *regs)
+static void pl011_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct pl011 *uart = port->uart;
--- a/xen/drivers/char/scif-uart.c
+++ b/xen/drivers/char/scif-uart.c
@@ -102,7 +102,7 @@ static const struct port_params port_par
     },
 };
 
-static void scif_uart_interrupt(int irq, void *data, struct cpu_user_regs 
*regs)
+static void scif_uart_interrupt(int irq, void *data)
 {
     struct serial_port *port = data;
     struct scif_uart *uart = port->uart;
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -718,8 +718,7 @@ static void cf_check do_amd_iommu_irq(vo
 
 static DECLARE_SOFTIRQ_TASKLET(amd_iommu_irq_tasklet, do_amd_iommu_irq, NULL);
 
-static void cf_check iommu_interrupt_handler(
-    int irq, void *dev_id, struct cpu_user_regs *regs)
+static void cf_check iommu_interrupt_handler(int irq, void *dev_id)
 {
     unsigned long flags;
     struct amd_iommu *iommu = dev_id;
--- a/xen/drivers/passthrough/arm/ipmmu-vmsa.c
+++ b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
@@ -642,7 +642,7 @@ static void ipmmu_domain_irq(struct ipmm
                         domain->d, status, iova);
 }
 
-static void ipmmu_irq(int irq, void *dev, struct cpu_user_regs *regs)
+static void ipmmu_irq(int irq, void *dev)
 {
     struct ipmmu_vmsa_device *mmu = dev;
     unsigned int i;
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -1097,16 +1097,14 @@ static irqreturn_t arm_smmu_global_fault
 }
 
 /* Xen: Interrupt handlers wrapper */
-static void arm_smmu_context_fault_xen(int irq, void *dev,
-                                      struct cpu_user_regs *regs)
+static void arm_smmu_context_fault_xen(int irq, void *dev)
 {
        arm_smmu_context_fault(irq, dev);
 }
 
 #define arm_smmu_context_fault arm_smmu_context_fault_xen
 
-static void arm_smmu_global_fault_xen(int irq, void *dev,
-                                     struct cpu_user_regs *regs)
+static void arm_smmu_global_fault_xen(int irq, void *dev)
 {
        arm_smmu_global_fault(irq, dev);
 }
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -880,8 +880,7 @@ static void arm_smmu_priq_tasklet(void *
 
 static int arm_smmu_device_disable(struct arm_smmu_device *smmu);
 
-static void arm_smmu_gerror_handler(int irq, void *dev,
-                               struct cpu_user_regs *regs)
+static void arm_smmu_gerror_handler(int irq, void *dev)
 {
        u32 gerror, gerrorn, active;
        struct arm_smmu_device *smmu = dev;
@@ -926,12 +925,11 @@ static void arm_smmu_gerror_handler(int
        writel(gerror, smmu->base + ARM_SMMU_GERRORN);
 }
 
-static void arm_smmu_combined_irq_handler(int irq, void *dev,
-                               struct cpu_user_regs *regs)
+static void arm_smmu_combined_irq_handler(int irq, void *dev)
 {
        struct arm_smmu_device *smmu = dev;
 
-       arm_smmu_gerror_handler(irq, dev, regs);
+       arm_smmu_gerror_handler(irq, dev);
 
        tasklet_schedule(&(smmu->combined_irq_tasklet));
 }
@@ -945,16 +943,14 @@ static void arm_smmu_combined_irq_taskle
                arm_smmu_priq_tasklet(dev);
 }
 
-static void arm_smmu_evtq_irq_tasklet(int irq, void *dev,
-                               struct cpu_user_regs *regs)
+static void arm_smmu_evtq_irq_tasklet(int irq, void *dev)
 {
        struct arm_smmu_device *smmu = dev;
 
        tasklet_schedule(&(smmu->evtq_irq_tasklet));
 }
 
-static void arm_smmu_priq_irq_tasklet(int irq, void *dev,
-                               struct cpu_user_regs *regs)
+static void arm_smmu_priq_irq_tasklet(int irq, void *dev)
 {
        struct arm_smmu_device *smmu = dev;
 
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1119,8 +1119,7 @@ static void cf_check do_iommu_page_fault
         __do_iommu_page_fault(drhd->iommu);
 }
 
-static void cf_check iommu_page_fault(
-    int irq, void *dev_id, struct cpu_user_regs *regs)
+static void cf_check iommu_page_fault(int irq, void *dev_id)
 {
     /*
      * Just flag the tasklet as runnable. This is fine, according to VT-d
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -18,7 +18,7 @@
     ASSERT(!in_irq() && (local_irq_is_enabled() || num_online_cpus() <= 1))
 
 struct irqaction {
-    void (*handler)(int irq, void *dev_id, struct cpu_user_regs *regs);
+    void (*handler)(int irq, void *dev_id);
     const char *name;
     void *dev_id;
     bool free_on_release;
@@ -119,12 +119,11 @@ extern int setup_irq(unsigned int irq, u
                      struct irqaction *new);
 extern void release_irq(unsigned int irq, const void *dev_id);
 extern int request_irq(unsigned int irq, unsigned int irqflags,
-               void (*handler)(int irq, void *dev_id,
-                     struct cpu_user_regs *regs),
+               void (*handler)(int irq, void *dev_id),
                const char *devname, void *dev_id);
 
 extern hw_irq_controller no_irq_type;
-void cf_check no_action(int cpl, void *dev_id, struct cpu_user_regs *regs);
+void cf_check no_action(int cpl, void *dev_id);
 unsigned int cf_check irq_startup_none(struct irq_desc *desc);
 void cf_check irq_actor_none(struct irq_desc *desc);
 #define irq_shutdown_none irq_actor_none