tracing: Reset the function filter after completing trampoline/graph selftest

[ Upstream commit e35c2d8e22745751cf304ec3fe39616643db2e0a ]

The direct trampoline and graph coexistence test sets global_ops to
trace only 'trace_selftest_dynamic_test_func', but does not reset it
after the test is completed, resulting in the function filter being set
already after the system starts. Although it can be reset through the
tracefs interface, it is more or less confusing to the user, and we
should reset it to trace all functions after the trampoline/graph test
completes.

Link: https://lkml.kernel.org/r/20220427034119.24668-1-lihuafei1@huawei.com
Link: https://lore.kernel.org/all/20220418073958.104029-1-lihuafei1@huawei.com/
Fixes: 130c08065848 ("tracing: Add trampoline/graph selftest")
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index abcadbe933bb7662725b7ed4b4930bd73bd3ff01..a2d301f58ceda90cd3485db8f74627f955e73eb6 100644 (file)
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -895,6 +895,9 @@ trace_selftest_startup_function_graph(struct tracer *trace,
                ret = -1;
                goto out;
        }
+
+       /* Enable tracing on all functions again */
+       ftrace_set_global_filter(NULL, 0, 1);
 #endif
 
        /* Don't test dynamic tracing, the function tracer already did */