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linux-7.2.3/arch/s390/kernel/trace.c

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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Tracepoint definitions for s390
+ *
+ * Copyright IBM Corp. 2015
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/percpu.h>
+#define CREATE_TRACE_POINTS
+#include <asm/trace/diag.h>
+
+EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
+
+static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
+
+void notrace trace_s390_diagnose_norecursion(int diag_nr)
+{
+	unsigned long flags;
+	unsigned int *depth;
+
+	/* Avoid lockdep recursion. */
+	if (IS_ENABLED(CONFIG_LOCKDEP))
+		return;
+	local_irq_save(flags);
+	depth = this_cpu_ptr(&diagnose_trace_depth);
+	if (*depth == 0) {
+		(*depth)++;
+		trace_s390_diagnose(diag_nr);
+		(*depth)--;
+	}
+	local_irq_restore(flags);
+}