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ftrace: Remove global function list and call function directly

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Instead of having a list of global functions that are called,
as only one global function is allow to be enabled at a time, there's
no reason to have a list.

Instead, simply have all the users of the global ops, use the global ops
directly, instead of registering their own ftrace_ops. Just switch what
function is used before enabling the function tracer.

This removes a lot of code as well as the complexity involved with it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-01-10 17:01:58 -05:00 • committed by Steven Rostedt
parent a798c10faf
commit 4104d326b6
8 changed files with 133 additions and 221 deletions
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33
kernel/trace/trace_selftest.c
View file

@ -161,11 +161,6 @@ static struct ftrace_ops test_probe3 = {
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
};
static struct ftrace_ops test_global = {
.func = trace_selftest_test_global_func,
.flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
};
static void print_counts(void)
{
printk("(%d %d %d %d %d) ",
@ -185,7 +180,7 @@ static void reset_counts(void)
trace_selftest_test_dyn_cnt = 0;
}
static int trace_selftest_ops(int cnt)
static int trace_selftest_ops(struct trace_array *tr, int cnt)
{
int save_ftrace_enabled = ftrace_enabled;
struct ftrace_ops *dyn_ops;
@ -220,7 +215,11 @@ static int trace_selftest_ops(int cnt)
register_ftrace_function(&test_probe1);
register_ftrace_function(&test_probe2);
register_ftrace_function(&test_probe3);
register_ftrace_function(&test_global);
/* First time we are running with main function */
if (cnt > 1) {
ftrace_init_array_ops(tr, trace_selftest_test_global_func);
register_ftrace_function(tr->ops);
}
DYN_FTRACE_TEST_NAME();
@ -232,8 +231,10 @@ static int trace_selftest_ops(int cnt)
goto out;
if (trace_selftest_test_probe3_cnt != 1)
goto out;
if (trace_selftest_test_global_cnt == 0)
goto out;
if (cnt > 1) {
if (trace_selftest_test_global_cnt == 0)
goto out;
}
DYN_FTRACE_TEST_NAME2();
@ -269,8 +270,10 @@ static int trace_selftest_ops(int cnt)
goto out_free;
if (trace_selftest_test_probe3_cnt != 3)
goto out_free;
if (trace_selftest_test_global_cnt == 0)
goto out;
if (cnt > 1) {
if (trace_selftest_test_global_cnt == 0)
goto out;
}
if (trace_selftest_test_dyn_cnt == 0)
goto out_free;
@ -295,7 +298,9 @@ static int trace_selftest_ops(int cnt)
unregister_ftrace_function(&test_probe1);
unregister_ftrace_function(&test_probe2);
unregister_ftrace_function(&test_probe3);
unregister_ftrace_function(&test_global);
if (cnt > 1)
unregister_ftrace_function(tr->ops);
ftrace_reset_array_ops(tr);
/* Make sure everything is off */
reset_counts();
@ -388,7 +393,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
}
/* Test the ops with global tracing running */
ret = trace_selftest_ops(1);
ret = trace_selftest_ops(tr, 1);
trace->reset(tr);
out:
@ -399,7 +404,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
/* Test the ops with global tracing off */
if (!ret)
ret = trace_selftest_ops(2);
ret = trace_selftest_ops(tr, 2);
return ret;
}