Cleanup: Move wrapper/ headers to include/wrapper/

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

diff --git a/include/wrapper/timer.h b/include/wrapper/timer.h
new file mode 100644 (file)
index 0000000..76c8a57
--- /dev/null
+++ b/include/wrapper/timer.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/timer.h
+ *
+ * wrapper around linux/timer.h.
+ *
+ * Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_TIMER_H
+#define _LTTNG_WRAPPER_TIMER_H
+
+#include <linux/version.h>
+#include <linux/timer.h>
+#include <lttng/kernel-version.h>
+
+/*
+ * In the olden days, pinned timers were initialized normaly with init_timer()
+ * and then modified with mod_timer_pinned().
+ *
+ * Then came kernel 4.8.0 and they had to be initilized as pinned with
+ * init_timer_pinned() and then modified as regular timers with mod_timer().
+ *
+ * Then came kernel 4.15.0 with a new timer API where init_timer() is no more.
+ * It's replaced by timer_setup() where pinned is now part of timer flags.
+ */
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
+
+#define LTTNG_TIMER_PINNED             TIMER_PINNED
+#define LTTNG_TIMER_FUNC_ARG_TYPE      struct timer_list *
+
+#define lttng_mod_timer_pinned(timer, expires) \
+       mod_timer(timer, expires)
+
+#define lttng_from_timer(var, callback_timer, timer_fieldname) \
+       from_timer(var, callback_timer, timer_fieldname)
+
+#define lttng_timer_setup(timer, callback, flags, unused) \
+       timer_setup(timer, callback, flags)
+
+
+#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */
+
+
+# if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) \
+       || LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0))
+
+#define lttng_init_timer_pinned(timer) \
+       init_timer_pinned(timer)
+
+#define lttng_mod_timer_pinned(timer, expires) \
+       mod_timer(timer, expires)
+
+# else /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */
+
+#define lttng_init_timer_pinned(timer) \
+       init_timer(timer)
+
+#define lttng_mod_timer_pinned(timer, expires) \
+       mod_timer_pinned(timer, expires)
+
+# endif /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */
+
+
+#define LTTNG_TIMER_PINNED             TIMER_PINNED
+#define LTTNG_TIMER_FUNC_ARG_TYPE      unsigned long
+
+/* timer_fieldname is unused prior to 4.15. */
+#define lttng_from_timer(var, timer_data, timer_fieldname) \
+       ((typeof(var))timer_data)
+
+static inline void lttng_timer_setup(struct timer_list *timer,
+               void (*function)(LTTNG_TIMER_FUNC_ARG_TYPE),
+               unsigned int flags, void *data)
+{
+       if (flags & LTTNG_TIMER_PINNED)
+               lttng_init_timer_pinned(timer);
+       else
+               init_timer(timer);
+
+       timer->function = function;
+       timer->data = (unsigned long)data;
+}
+
+#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */
+
+#endif /* _LTTNG_WRAPPER_TIMER_H */