Add support for tracepoints receiving no argument as parameters. Copied from Linux kernel:
commit 38516ab59fbc5b3bb278cf5e1fe2867c70cff32e Author: Steven Rostedt <[email protected]> Date: Tue Apr 20 17:04:50 2010 -0400 Signed-off-by: Mathieu Desnoyers <[email protected]> CC: Nils Carlson <[email protected]> CC: Steven Rostedt <[email protected]> --- include/ust/tracepoint.h | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) Index: ust/include/ust/tracepoint.h =================================================================== --- ust.orig/include/ust/tracepoint.h +++ ust/include/ust/tracepoint.h @@ -175,10 +175,27 @@ static inline void tracepoint_update_pro { } #endif /* CONFIG_TRACEPOINTS */ -#define DECLARE_TRACE(name, proto, args) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ - PARAMS(void *__data, proto), \ - PARAMS(__data, args)) +/* + * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype + * (void). "void" is a special value in a function prototype and can + * not be combined with other arguments. Since the DECLARE_TRACE() + * macro adds a data element at the beginning of the prototype, + * we need a way to differentiate "(void *data, proto)" from + * "(void *data, void)". The second prototype is invalid. + * + * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype + * and "void *__data" as the callback prototype. + * + * DECLARE_TRACE() passes "proto" as the tracepoint protoype and + * "void *__data, proto" as the callback prototype. + */ +#define DECLARE_TRACE_NOARGS(name) \ + __DECLARE_TRACE(name, void, , void *__data, __data) + +#define DECLARE_TRACE(name, proto, args) \ + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + PARAMS(void *__data, proto), \ + PARAMS(__data, args)) /* * Connect a probe to a tracepoint. -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
