v4.19.13 snapshot.
diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
new file mode 100644
index 0000000..2f7f27e
--- /dev/null
+++ b/arch/s390/include/asm/irq.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IRQ_H
+#define _ASM_IRQ_H
+
+#define EXT_INTERRUPT 0
+#define IO_INTERRUPT 1
+#define THIN_INTERRUPT 2
+
+#define NR_IRQS_BASE 3
+
+#define NR_IRQS NR_IRQS_BASE
+#define NR_IRQS_LEGACY NR_IRQS_BASE
+
+/* External interruption codes */
+#define EXT_IRQ_INTERRUPT_KEY 0x0040
+#define EXT_IRQ_CLK_COMP 0x1004
+#define EXT_IRQ_CPU_TIMER 0x1005
+#define EXT_IRQ_WARNING_TRACK 0x1007
+#define EXT_IRQ_MALFUNC_ALERT 0x1200
+#define EXT_IRQ_EMERGENCY_SIG 0x1201
+#define EXT_IRQ_EXTERNAL_CALL 0x1202
+#define EXT_IRQ_TIMING_ALERT 0x1406
+#define EXT_IRQ_MEASURE_ALERT 0x1407
+#define EXT_IRQ_SERVICE_SIG 0x2401
+#define EXT_IRQ_CP_SERVICE 0x2603
+#define EXT_IRQ_IUCV 0x4000
+
+#ifndef __ASSEMBLY__
+
+#include <linux/hardirq.h>
+#include <linux/percpu.h>
+#include <linux/cache.h>
+#include <linux/types.h>
+
+enum interruption_class {
+ IRQEXT_CLK,
+ IRQEXT_EXC,
+ IRQEXT_EMS,
+ IRQEXT_TMR,
+ IRQEXT_TLA,
+ IRQEXT_PFL,
+ IRQEXT_DSD,
+ IRQEXT_VRT,
+ IRQEXT_SCP,
+ IRQEXT_IUC,
+ IRQEXT_CMS,
+ IRQEXT_CMC,
+ IRQEXT_FTP,
+ IRQIO_CIO,
+ IRQIO_QAI,
+ IRQIO_DAS,
+ IRQIO_C15,
+ IRQIO_C70,
+ IRQIO_TAP,
+ IRQIO_VMR,
+ IRQIO_LCS,
+ IRQIO_CTC,
+ IRQIO_APB,
+ IRQIO_ADM,
+ IRQIO_CSC,
+ IRQIO_PCI,
+ IRQIO_MSI,
+ IRQIO_VIR,
+ IRQIO_VAI,
+ NMI_NMI,
+ CPU_RST,
+ NR_ARCH_IRQS
+};
+
+struct irq_stat {
+ unsigned int irqs[NR_ARCH_IRQS];
+};
+
+DECLARE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
+
+static __always_inline void inc_irq_stat(enum interruption_class irq)
+{
+ __this_cpu_inc(irq_stat.irqs[irq]);
+}
+
+struct ext_code {
+ unsigned short subcode;
+ unsigned short code;
+};
+
+typedef void (*ext_int_handler_t)(struct ext_code, unsigned int, unsigned long);
+
+int register_external_irq(u16 code, ext_int_handler_t handler);
+int unregister_external_irq(u16 code, ext_int_handler_t handler);
+
+enum irq_subclass {
+ IRQ_SUBCLASS_MEASUREMENT_ALERT = 5,
+ IRQ_SUBCLASS_SERVICE_SIGNAL = 9,
+};
+
+#define CR0_IRQ_SUBCLASS_MASK \
+ ((1UL << (63 - 30)) /* Warning Track */ | \
+ (1UL << (63 - 48)) /* Malfunction Alert */ | \
+ (1UL << (63 - 49)) /* Emergency Signal */ | \
+ (1UL << (63 - 50)) /* External Call */ | \
+ (1UL << (63 - 52)) /* Clock Comparator */ | \
+ (1UL << (63 - 53)) /* CPU Timer */ | \
+ (1UL << (63 - 54)) /* Service Signal */ | \
+ (1UL << (63 - 57)) /* Interrupt Key */ | \
+ (1UL << (63 - 58)) /* Measurement Alert */ | \
+ (1UL << (63 - 59)) /* Timing Alert */ | \
+ (1UL << (63 - 62))) /* IUCV */
+
+void irq_subclass_register(enum irq_subclass subclass);
+void irq_subclass_unregister(enum irq_subclass subclass);
+
+#define irq_canonicalize(irq) (irq)
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_IRQ_H */