GNU Linux-libre 4.19.207-gnu1
[releases.git] / arch / s390 / kernel / trace.c
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 }