[thirdparty/kernel/linux.git] / arch / s390 / kernel / trace.c

// 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 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);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b5a6b71b MS	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
230ccb37	13	EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
b5a6b71b MS	14
	15	static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
	16
230ccb37	17	void trace_s390_diagnose_norecursion(int diag_nr)
b5a6b71b MS	18	{
	19	unsigned long flags;
	20	unsigned int *depth;
	21
f6c9b160 HC	22	/* Avoid lockdep recursion. */
	23	if (IS_ENABLED(CONFIG_LOCKDEP))
	24	return;
b5a6b71b MS	25	local_irq_save(flags);
	26	depth = this_cpu_ptr(&diagnose_trace_depth);
	27	if (*depth == 0) {
	28	(*depth)++;
230ccb37	29	trace_s390_diagnose(diag_nr);
b5a6b71b MS	30	(*depth)--;
	31	}
	32	local_irq_restore(flags);
	33	}