1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Tracepoint definitions for s390 4 * 5 * Copyright IBM Corp. 2015 6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 7 */ 8 9 #include <linux/percpu.h> 10 #define CREATE_TRACE_POINTS 11 #include <asm/trace/diag.h> 12 13 EXPORT_TRACEPOINT_SYMBOL(s390_diagnose); 14 15 static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth); 16 17 void notrace trace_s390_diagnose_norecursion(int diag_nr) 18 { 19 unsigned long flags; 20 unsigned int *depth; 21 22 /* Avoid lockdep recursion. */ 23 if (IS_ENABLED(CONFIG_LOCKDEP)) 24 return; 25 local_irq_save(flags); 26 depth = this_cpu_ptr(&diagnose_trace_depth); 27 if (*depth == 0) { 28 (*depth)++; 29 trace_s390_diagnose(diag_nr); 30 (*depth)--; 31 } 32 local_irq_restore(flags); 33 } 34