Re: [BUG] tracing: dynamic ftrace selftest detected failures

Masami Hiramatsu
2024-08-19T15:56:53Z

On Mon, 19 Aug 2024 11:29:02 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Mon, 19 Aug 2024 17:11:52 +0900
> Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
>
> > CONFIG_LTO=y
> > CONFIG_LTO_CLANG=y
>
> Hi Masami,
>
> Does it still fail if you disable the above?

No, I found that caused these failure.

> I wonder if that causes functions to not be part of the available filter
> functions that the ftrace filter test is using :-/

Ah, LTO optimized the target function call... (same as ftrace-direct example)

>
> We may need to add "noinline" or something to make sure those functions
> don't get inlined for LTO.

Yeah, we need such option at least for function call test.

Thank you,

>
> -- Steve

--
Masami Hiramatsu (Google) <mhiramat@kernel.org>