GNU Linux-libre 4.9.288-gnu1
[releases.git] / arch / s390 / kernel / trace.c
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 }