Commit 8f768993 authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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tracing: Add ref_data to function and fgraph tracer structs

The selftest for function and function graph tracers are defined as
__init, as they are only executed at boot up. The "tracer" structs
that are associated to those tracers are not setup as __init as they
are used after boot. To stop mismatch warnings, those structures
need to be annotated with __ref_data.

Currently, the tracer structures are defined to __read_mostly, as they
do not really change. But in the future they should be converted to
consts, but that will take a little work because they have a "next"
pointer that gets updated when they are registered. That will have to
wait till the next major release.


Reported-by: default avatarkbuild test robot <>
Reported-by: default avatarChen Gang <>
Signed-off-by: default avatarSteven Rostedt <>
parent f77d09a3
......@@ -680,6 +680,15 @@ extern int trace_selftest_startup_sched_switch(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_branch(struct tracer *trace,
struct trace_array *tr);
* Tracer data references selftest functions that only occur
* on boot up. These can be __init functions. Thus, when selftests
* are enabled, then the tracers need to reference __init functions.
#define __tracer_data __refdata
/* Tracers are seldom changed. Optimize when selftests are disabled. */
#define __tracer_data __read_mostly
extern void *head_page(struct trace_array_cpu *data);
......@@ -199,7 +199,7 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
return 0;
static struct tracer function_trace __read_mostly =
static struct tracer function_trace __tracer_data =
.name = "function",
.init = function_trace_init,
......@@ -1448,7 +1448,7 @@ static struct trace_event graph_trace_ret_event = {
.funcs = &graph_functions
static struct tracer graph_trace __read_mostly = {
static struct tracer graph_trace __tracer_data = {
.name = "function_graph",
.open = graph_trace_open,
.pipe_open = graph_trace_open,
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