Cleanup: Move all source files to src/

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

diff --git a/src/wrapper/irqdesc.c b/src/wrapper/irqdesc.c
new file mode 100644 (file)
index 0000000..397624b
--- /dev/null
+++ b/src/wrapper/irqdesc.c
@@ -0,0 +1,50 @@
+/* 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;
+       }
+}
+EXPORT_SYMBOL_GPL(wrapper_irq_to_desc);
+
+#else
+
+#include <linux/interrupt.h>
+#include <linux/irqnr.h>
+
+struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
+{
+       return irq_to_desc(irq);
+}
+EXPORT_SYMBOL_GPL(wrapper_irq_to_desc);
+
+#endif