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