timer API transition for kernel 4.15

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

diff --git a/wrapper/timer.h b/wrapper/timer.h
index c1c0c9526942fcadec87e9a11949b68fe47a56fd..4fc9828c4279fa2e25b78e553e80b208b110c2fb 100644 (file)
--- a/wrapper/timer.h
+++ b/wrapper/timer.h
@@ -27,30 +27,76 @@
 #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)
+
 
-#if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) \
+#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)                                 \
+#define lttng_init_timer_pinned(timer) \
        init_timer_pinned(timer)
 
-static inline int lttng_mod_timer_pinned(struct timer_list *timer,
-               unsigned long expires)
-{
-       return mod_timer(timer, expires);
-}
+#define lttng_mod_timer_pinned(timer, expires) \
+       mod_timer(timer, expires)
 
-#else
+# else /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */
 
-#define lttng_init_timer_pinned(timer)                                 \
+#define lttng_init_timer_pinned(timer) \
        init_timer(timer)
 
-static inline int lttng_mod_timer_pinned(struct timer_list *timer,
-               unsigned long expires)
+#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)
 {
-       return mod_timer_pinned(timer, expires);
+       if (flags & LTTNG_TIMER_PINNED)
+               lttng_init_timer_pinned(timer);
+       else
+               init_timer(timer);
+
+       timer->function = function;
+       timer->data = (unsigned long)data;
 }
 
-#endif
+#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */
 
 #endif /* _LTTNG_WRAPPER_TIMER_H */