linux-kernel - Re: [PATCH -v5 05/17] x86/ftrace: Use text

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Message-ID: <20191113092741.18abd63b@gandalf.local.home>
Date:   Wed, 13 Nov 2019 09:27:41 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com, jeyu@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH -v5 05/17] x86/ftrace: Use text_poke()

On Wed, 13 Nov 2019 10:01:04 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> > And that printk() never printed, even after running the ftracetests.  
> 
> Well, then wth did it do that set_all_modules_text_rw() nonsense?
> Because all I did was preserve that semantic.

Because the ftracetests obviously is missing a check :-p

It never printed when running those tests, but when I did a simple:

 # trace-cmd start -p function
 # modprobe <some-module>

The printk appeared.

Yeah, let's keep it this way, but still needs a comment.

-- Steve