Messages in this thread Patch in this message | | | From | Joe Perches <> | Subject | [RFC PATCH 1/2] trace: Move data to new section _ftrace_data | Date | Tue, 18 Feb 2020 18:03:17 -0800 |
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Move the data used by tracing to a separate section to help identify and perhaps control access to tracing data.
Signed-off-by: Joe Perches <joe@perches.com> --- include/trace/trace_events.h | 31 ++++++++++++++++++++++--------- kernel/trace/trace_export.c | 10 +++++++--- 2 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h index 502c7b..361999f 100644 --- a/include/trace/trace_events.h +++ b/include/trace/trace_events.h @@ -369,7 +369,9 @@ trace_raw_output_##call(struct trace_iterator *iter, int flags, \ \ return trace_handle_return(s); \ } \ -static struct trace_event_functions trace_event_type_funcs_##call = { \ +static struct trace_event_functions \ +__attribute__((section("_ftrace_data"))) \ +trace_event_type_funcs_##call = { \ .trace = trace_raw_output_##call, \ }; @@ -439,9 +441,12 @@ static struct trace_event_functions trace_event_type_funcs_##call = { \ #undef DECLARE_EVENT_CLASS #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \ -static struct trace_event_fields trace_event_fields_##call[] = { \ +static struct trace_event_fields \ +__attribute__((section("_ftrace_data"))) \ +trace_event_fields_##call[] = { \ tstruct \ - {} }; + {} \ +}; #undef DEFINE_EVENT #define DEFINE_EVENT(template, name, proto, args) @@ -746,7 +751,8 @@ static inline void ftrace_test_probe_##call(void) \ #undef DECLARE_EVENT_CLASS #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ _TRACE_PERF_PROTO(call, PARAMS(proto)); \ -static char print_fmt_##call[] = print; \ +static char __attribute__((section("_ftrace_data"))) \ +print_fmt_##call[] = print; \ static struct trace_event_class __used __refdata event_class_##call = { \ .system = TRACE_SYSTEM_STRING, \ .fields_array = trace_event_fields_##call, \ @@ -760,7 +766,9 @@ static struct trace_event_class __used __refdata event_class_##call = { \ #undef DEFINE_EVENT #define DEFINE_EVENT(template, call, proto, args) \ \ -static struct trace_event_call __used event_##call = { \ +static struct trace_event_call __used \ +__attribute__((section("_ftrace_data"))) \ +event_##call = { \ .class = &event_class_##template, \ { \ .tp = &__tracepoint_##call, \ @@ -770,14 +778,18 @@ static struct trace_event_call __used event_##call = { \ .flags = TRACE_EVENT_FL_TRACEPOINT, \ }; \ static struct trace_event_call __used \ -__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call +__attribute__((section("_ftrace_events"))) \ +*__event_##call = &event_##call #undef DEFINE_EVENT_PRINT #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ \ -static char print_fmt_##call[] = print; \ +static char __attribute__((section("_ftrace_data"))) \ +print_fmt_##call[] = print; \ \ -static struct trace_event_call __used event_##call = { \ +static struct trace_event_call __used \ +__attribute__((section("_ftrace_data"))) \ +event_##call = { \ .class = &event_class_##template, \ { \ .tp = &__tracepoint_##call, \ @@ -787,6 +799,7 @@ static struct trace_event_call __used event_##call = { \ .flags = TRACE_EVENT_FL_TRACEPOINT, \ }; \ static struct trace_event_call __used \ -__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call +__attribute__((section("_ftrace_events"))) \ +*__event_##call = &event_##call #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c index 77ce5a..90af7c9 100644 --- a/kernel/trace/trace_export.c +++ b/kernel/trace/trace_export.c @@ -111,9 +111,12 @@ static void __always_unused ____ftrace_check_##name(void) \ #undef FTRACE_ENTRY #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ -static struct trace_event_fields ftrace_event_fields_##name[] = { \ +static struct trace_event_fields \ +__attribute__((section("_ftrace_data"))) \ +ftrace_event_fields_##name[] = { \ tstruct \ - {} }; + {} \ +}; #include "trace_entries.h" @@ -150,7 +153,8 @@ static struct trace_event_class __refdata event_class_ftrace_##call = { \ .reg = regfn, \ }; \ \ -struct trace_event_call __used event_##call = { \ +struct trace_event_call __used __attribute((section("_ftrace_data"))) \ +event_##call = { \ .class = &event_class_ftrace_##call, \ { \ .name = #call, \ -- 2.24.0
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