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SubjectRe: [PATCH 4/7] ftrace: Add FTRACE_ENTRY_REG macro to allow event registration
On Wed, Feb 15, 2012 at 03:51:51PM +0100, Jiri Olsa wrote:
> Adding FTRACE_ENTRY_REG macro so particular ftrace entries
> could specify registration function and thus become accesible
> via perf.
>
> This will be used in upcomming patch for function trace.
>
> Signed-off-by: Jiri Olsa <jolsa@redhat.com>

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>

> ---
> kernel/trace/trace.h | 4 ++++
> kernel/trace/trace_export.c | 18 ++++++++++++++++--
> 2 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 55c6ea0..638476a 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -68,6 +68,10 @@ enum trace_type {
> #undef FTRACE_ENTRY_DUP
> #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
>
> +#undef FTRACE_ENTRY_REG
> +#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
> + FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
> +
> #include "trace_entries.h"
>
> /*
> diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
> index bbeec31..f74de86 100644
> --- a/kernel/trace/trace_export.c
> +++ b/kernel/trace/trace_export.c
> @@ -18,6 +18,14 @@
> #undef TRACE_SYSTEM
> #define TRACE_SYSTEM ftrace
>
> +/*
> + * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
> + * function and thus become accesible via perf.
> + */
> +#undef FTRACE_ENTRY_REG
> +#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
> + FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
> +
> /* not needed for this file */
> #undef __field_struct
> #define __field_struct(type, item)
> @@ -152,13 +160,14 @@ ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
> #undef F_printk
> #define F_printk(fmt, args...) #fmt ", " __stringify(args)
>
> -#undef FTRACE_ENTRY
> -#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
> +#undef FTRACE_ENTRY_REG
> +#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn)\
> \
> struct ftrace_event_class event_class_ftrace_##call = { \
> .system = __stringify(TRACE_SYSTEM), \
> .define_fields = ftrace_define_fields_##call, \
> .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
> + .reg = regfn, \
> }; \
> \
> struct ftrace_event_call __used event_##call = { \
> @@ -170,4 +179,9 @@ struct ftrace_event_call __used event_##call = { \
> struct ftrace_event_call __used \
> __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
>
> +#undef FTRACE_ENTRY
> +#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
> + FTRACE_ENTRY_REG(call, struct_name, etype, \
> + PARAMS(tstruct), PARAMS(print), NULL)
> +
> #include "trace_entries.h"
> --
> 1.7.1
>
> --
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