[mirror_ubuntu-zesty-kernel.git] / arch / s390 / kernel / trace.c

/*
 * 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;

	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
b5a6b71b MS	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
230ccb37	12	EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
b5a6b71b MS	13
	14	static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
	15
230ccb37	16	void trace_s390_diagnose_norecursion(int diag_nr)
b5a6b71b MS	17	{
	18	unsigned long flags;
	19	unsigned int *depth;
	20
	21	local_irq_save(flags);
	22	depth = this_cpu_ptr(&diagnose_trace_depth);
	23	if (*depth == 0) {
	24	(*depth)++;
230ccb37	25	trace_s390_diagnose(diag_nr);
b5a6b71b MS	26	(*depth)--;
	27	}
	28	local_irq_restore(flags);
	29	}