From: Mathieu Desnoyers This check is meant to be used by tracepoint users which do a direct cast of callbacks to (void *) for direct registration, thus bypassing the register_trace_##name and unregister_trace_##name checks. This permits to ensure that the callback type matches the function type at the call site, but without generating any code. Acked-by: Masami Hiramatsu Acked-by: Frederic Weisbecker Signed-off-by: Mathieu Desnoyers LKML-Reference: <20100430165959.GA25605@Krystal> CC: Ingo Molnar CC: Andrew Morton CC: Thomas Gleixner CC: Peter Zijlstra CC: Arnaldo Carvalho de Melo CC: Lai Jiangshan CC: Li Zefan CC: Christoph Hellwig Signed-off-by: Steven Rostedt --- include/linux/tracepoint.h | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 1d85f9a..8d5e4f6 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -137,9 +137,11 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin, static inline int unregister_trace_##name(void (*probe)(proto)) \ { \ return tracepoint_probe_unregister(#name, (void *)probe);\ + } \ + static inline void check_trace_callback_type_##name(void (*cb)(proto)) \ + { \ } - #define DEFINE_TRACE_FN(name, reg, unreg) \ static const char __tpstrtab_##name[] \ __attribute__((section("__tracepoints_strings"))) = #name; \ @@ -168,6 +170,9 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin, static inline int unregister_trace_##name(void (*probe)(proto)) \ { \ return -ENOSYS; \ + } \ + static inline void check_trace_callback_type_##name(void (*cb)(proto)) \ + { \ } #define DEFINE_TRACE_FN(name, reg, unreg) -- 1.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/