linux-kernel - Re: Reference to non-existing DYNAMIC_FTRACE_WITH

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Date:   Fri, 6 Aug 2021 09:22:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     live-patching@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: Re: Reference to non-existing DYNAMIC_FTRACE_WITH_ARGS

On Fri, 6 Aug 2021 12:18:36 +0200
Lukas Bulwahn <lukas.bulwahn@...il.com> wrote:

> Hi Steven,

Hi Lukas, thanks for the report.

> Did you intend to depend on the existing "HAVE_DYNAMIC_FTRACE_WITH_ARGS" here?
> 
> Or did you intend to add a new config DYNAMIC_FTRACE_WITH_ARGS
> analogously to DYNAMIC_FTRACE_WITH_REGS as defined in
> ./kernel/trace/Kconfig (see below)?
> 
> config DYNAMIC_FTRACE_WITH_REGS
>         def_bool y
>         depends on DYNAMIC_FTRACE
>         depends on HAVE_DYNAMIC_FTRACE_WITH_REGS
> 
> I am happy to provide a patch, once I understand what was intended here.
> 

Yeah, that looks to be the missing part. The
HAVE_DYNAMIC_FTRACE_WITH_ARGS is just showing support, but knowing it
is enabled would require DYNAMIC_FTRACE being set (which is user
enabled).

Feel free to send a patch, and mark it for stable.

-- Steve