linux-kernel - Re: [patch V4 part 4 01/24] x86/int3: Ensure that poke_int3

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Message-ID: <CALCETrUYs65iSW5eeNLMtdAWuHFbg_ywE32whSh0kJ9JVZCbVw@mail.gmail.com>
Date:   Wed, 13 May 2020 21:57:12 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V4 part 4 01/24] x86/int3: Ensure that poke_int3_handler()
 is not traced

On Tue, May 5, 2020 at 7:15 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> From: Thomas Gleixner <tglx@...utronix.de>
>
> In order to ensure poke_int3_handler() is completely self contained -- this
> is called while modifying other text, imagine the fun of hitting another
> INT3 -- ensure that everything it uses is not traced.
>
> The primary means here is to force inlining; bsearch() is notrace because
> all of lib/ is.


Acked-by: Andy Lutomirski <luto@...nel.org>