linux-kernel - Re: [PATCH] ftrace: Remove possible deadlock between register_kprobe() and ftrace_run_update

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Message-ID: <20190627192513.31abac73@gandalf.local.home>
Date:   Thu, 27 Jun 2019 19:25:13 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Miroslav Benes <mbenes@...e.cz>, Jessica Yu <jeyu@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        Johannes Erdfelt <johannes@...felt.com>,
        Ingo Molnar <mingo@...nel.org>, mhiramat@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: [PATCH] ftrace: Remove possible deadlock between
 register_kprobe() and ftrace_run_update_code()

On Thu, 27 Jun 2019 18:19:52 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> /me dodges frozen shark
> 
> You are right of course.  My brain has apparently already shut off for
> the day.

And I agreed with your miscalculation. I guess I should have looked
deeper into it. Or have less faith in you ;-)

> 
> Maybe a comment or two would help though.

Agreed, this is fragile. I'll just add a patch on top of it with some
comments and pull this in today.

-- Steve