[lttng-modules.git] / wrapper / irqdesc.c

/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
 *
 * wrapper/irqdesc.c
 *
 * wrapper around irq_to_desc. Using KALLSYMS to get its address when
 * available, else we need to have a kernel that exports this function to GPL
 * modules. This export was added to the 3.4 kernels.
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <lttng-kernel-version.h>

#if (defined(CONFIG_KALLSYMS) \
	&& (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)))

#include <linux/kallsyms.h>
#include <linux/interrupt.h>
#include <linux/irqnr.h>
#include <wrapper/kallsyms.h>
#include <wrapper/irqdesc.h>

static
struct irq_desc *(*irq_to_desc_sym)(unsigned int irq);

struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
{
	if (!irq_to_desc_sym)
		irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc");
	if (irq_to_desc_sym) {
		return irq_to_desc_sym(irq);
	} else {
		printk_once(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n");
		return NULL;
	}
}

#else

#include <linux/interrupt.h>
#include <linux/irqnr.h>

struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
{
	return irq_to_desc(irq);
}

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
	2	*
	3	* wrapper/irqdesc.c
	4	*
	5	* wrapper around irq_to_desc. Using KALLSYMS to get its address when
	6	* available, else we need to have a kernel that exports this function to GPL
	7	* modules. This export was added to the 3.4 kernels.
	8	*
	9	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	10	*/
	11
	12	#include <lttng-kernel-version.h>
	13
	14	#if (defined(CONFIG_KALLSYMS) \
	15	&& (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)))
	16
	17	#include <linux/kallsyms.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/irqnr.h>
	20	#include <wrapper/kallsyms.h>
	21	#include <wrapper/irqdesc.h>
	22
	23	static
	24	struct irq_desc (irq_to_desc_sym)(unsigned int irq);
	25
	26	struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
	27	{
	28	if (!irq_to_desc_sym)
	29	irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc");
	30	if (irq_to_desc_sym) {
	31	return irq_to_desc_sym(irq);
	32	} else {
	33	printk_once(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n");
	34	return NULL;
	35	}
	36	}
	37
	38	#else
	39
	40	#include <linux/interrupt.h>
	41	#include <linux/irqnr.h>
	42
	43	struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
	44	{
	45	return irq_to_desc(irq);
	46	}
	47
	48	#endif