Re: [PATCH 1/4] tracing: add DEFINE_TRACE_FMT to tracepoint.h
From: Mathieu Desnoyers
Date: Wed Feb 25 2009 - 11:09:39 EST
* Steven Rostedt (rostedt@xxxxxxxxxxx) wrote:
> On Wed, 25 Feb 2009, Peter Zijlstra wrote:
> > On Tue, 2009-02-24 at 21:56 -0500, Steven Rostedt wrote:
> > > +#define DEFINE_TRACE_FMT(name, proto, args, fmt) \
> > > + DECLARE_TRACE(name, TPPROTO(proto), TPARGS(args))
> > > +
> > If TPPROTO and TPARGS were anything but empty stubs, the above would add
> > them twice, no?
> I guess I can rename them too.
> The problem comes from passing in more than one argument. If a proto or
> args has a comma, you get a nasty error about unmatched number of
> I believe that they were purposely made to be empty stubs to allow for
> multiple parameters. But you are right, if that changes we need to fix it.
> Since the above is only to protect against the substitution into multiple
> parameters, we could probably create a new macro name to just be
> #define PARAMS(args...) args
> #define DEFINE_TRACE_FMT(name, proto, args, fmt) \
> DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
Yes, I think this should work. Just be careful to test passing a "void"
function parameter to these when you make any changes. This is a
> -- Steve
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