Cleanup: Move wrapper/ headers to include/wrapper/

[lttng-modules.git] / include / wrapper / tracepoint.h

diff --git a/include/wrapper/tracepoint.h b/include/wrapper/tracepoint.h
new file mode 100644 (file)
index 0000000..880638b
--- /dev/null
+++ b/include/wrapper/tracepoint.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/tracepoint.h
+ *
+ * wrapper around DECLARE_EVENT_CLASS.
+ *
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_TRACEPOINT_H
+#define _LTTNG_WRAPPER_TRACEPOINT_H
+
+#include <linux/version.h>
+#include <linux/tracepoint.h>
+#include <linux/module.h>
+
+#ifndef HAVE_KABI_2635_TRACEPOINT
+
+#define kabi_2635_tracepoint_probe_register tracepoint_probe_register
+#define kabi_2635_tracepoint_probe_unregister tracepoint_probe_unregister
+
+#endif /* HAVE_KABI_2635_TRACEPOINT */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0))
+
+#include <lttng/tracepoint.h>
+
+#define lttng_wrapper_tracepoint_probe_register lttng_tracepoint_probe_register
+#define lttng_wrapper_tracepoint_probe_unregister lttng_tracepoint_probe_unregister
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
+
+#define lttng_wrapper_tracepoint_probe_register kabi_2635_tracepoint_probe_register
+#define lttng_wrapper_tracepoint_probe_unregister kabi_2635_tracepoint_probe_unregister
+
+static inline
+int lttng_tracepoint_init(void)
+{
+       return 0;
+}
+
+static inline
+void lttng_tracepoint_exit(void)
+{
+}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG))
+
+#include <linux/kallsyms.h>
+#include <wrapper/kallsyms.h>
+
+static inline
+int wrapper_tracepoint_module_notify(struct notifier_block *nb,
+               unsigned long val, struct module *mod)
+{
+       int (*tracepoint_module_notify_sym)(struct notifier_block *nb,
+                       unsigned long val, struct module *mod);
+
+       tracepoint_module_notify_sym =
+               (void *) kallsyms_lookup_funcptr("tracepoint_module_notify");
+       if (tracepoint_module_notify_sym) {
+               return tracepoint_module_notify_sym(nb, val, mod);
+       } else {
+               printk_once(KERN_WARNING "LTTng: tracepoint_module_notify symbol lookup failed. It probably means you kernel don't need this work-around. Please consider upgrading LTTng modules to make this warning go away.\n");
+               return -ENOSYS;
+       }
+}
+
+#endif /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG)) */
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE))
+
+static inline
+int wrapper_lttng_fixup_sig(struct module *mod)
+{
+       int ret = 0;
+
+       /*
+        * This is for module.c confusing force loaded modules with
+        * unsigned modules.
+        */
+       if (!THIS_MODULE->sig_ok &&
+                       THIS_MODULE->taints & (1U << TAINT_FORCED_MODULE)) {
+               THIS_MODULE->taints &= ~(1U << TAINT_FORCED_MODULE);
+               ret = wrapper_tracepoint_module_notify(NULL,
+                               MODULE_STATE_COMING, mod);
+               THIS_MODULE->taints |= (1U << TAINT_FORCED_MODULE);
+       }
+       return ret;
+}
+
+#else /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
+
+static inline
+int wrapper_lttng_fixup_sig(struct module *mod)
+{
+       return 0;
+}
+
+#endif /* #else #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+static inline struct tracepoint *lttng_tracepoint_ptr_deref(tracepoint_ptr_t *p)
+{
+       return tracepoint_ptr_deref(p);
+}
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
+static inline struct tracepoint *lttng_tracepoint_ptr_deref(struct tracepoint * const *p)
+{
+       return *p;
+}
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
+
+#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */