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    Subject[PATCH 5.18 692/879] tracing: Reset the function filter after completing trampoline/graph selftest
    Date
    From: Li Huafei <lihuafei1@huawei.com>

    [ 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>
    ---
    kernel/trace/trace_selftest.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
    index abcadbe933bb..a2d301f58ced 100644
    --- 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 */
    --
    2.35.1


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