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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-07-18 14:41:51 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-07-18 21:31:31 -0400 |
| commit | 8f768993394a8c0d3801033c11fd86ce8c88dcac (patch) | |
| tree | 67321d3042a7561729c55763190ffde07336904a /kernel/trace/trace.h | |
| parent | f77d09a384676bde6445413949d9d2c508ff3e62 (diff) | |
| download | blackbird-op-linux-8f768993394a8c0d3801033c11fd86ce8c88dcac.tar.gz blackbird-op-linux-8f768993394a8c0d3801033c11fd86ce8c88dcac.zip | |
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.
Link: http://lkml.kernel.org/r/1373596735.17876.84.camel@gandalf.local.home
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reported-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 4a4f6e1828b6..57b7bb0d39b7 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -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 +#else +/* Tracers are seldom changed. Optimize when selftests are disabled. */ +#define __tracer_data __read_mostly #endif /* CONFIG_FTRACE_STARTUP_TEST */ extern void *head_page(struct trace_array_cpu *data); |
