projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only) |
| 9f36eaed | 2 | * |
| 886d51a3 | 3 | * wrapper/irqdesc.c |
| c337ddc2 MD |
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 | |
| 0bbde272 | 7 | * modules. This export was added to the 3.4 kernels. |
| c337ddc2 | 8 | * |
| 886d51a3 | 9 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| c337ddc2 MD |
10 | */ |
| 11 | ||
| 0bbde272 MD |
12 | #include <lttng-kernel-version.h> |
| 13 | ||
| 14 | #if (defined(CONFIG_KALLSYMS) \ | |
| 15 | && (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))) | |
| c337ddc2 MD |
16 | |
| 17 | #include <linux/kallsyms.h> | |
| 18 | #include <linux/interrupt.h> | |
| 19 | #include <linux/irqnr.h> | |
| 5a2f5e92 MD |
20 | #include <wrapper/kallsyms.h> |
| 21 | #include <wrapper/irqdesc.h> | |
| c337ddc2 MD |
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) | |
| 1e543e7c | 29 | irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc"); |
| c337ddc2 MD |
30 | if (irq_to_desc_sym) { |
| 31 | return irq_to_desc_sym(irq); | |
| 32 | } else { | |
| e36de50d | 33 | printk_once(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n"); |
| c337ddc2 MD |
34 | return NULL; |
| 35 | } | |
| 36 | } | |
| 1c999280 | 37 | EXPORT_SYMBOL_GPL(wrapper_irq_to_desc); |
| c337ddc2 MD |
38 | |
| 39 | #else | |
| 40 | ||
| 41 | #include <linux/interrupt.h> | |
| 42 | #include <linux/irqnr.h> | |
| 43 | ||
| 44 | struct irq_desc *wrapper_irq_to_desc(unsigned int irq) | |
| 45 | { | |
| 46 | return irq_to_desc(irq); | |
| 47 | } | |
| 1c999280 | 48 | EXPORT_SYMBOL_GPL(wrapper_irq_to_desc); |
| c337ddc2 MD |
49 | |
| 50 | #endif |