linux-kernel - Re: [PATCH v2 2/8] x86/debug: Sync BTF earlier

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Message-ID: <CALCETrWN2YBd=VSiiCo40hFvaHn0uYLh=pmrO0aH6o01uVjjCg@mail.gmail.com>
Date:   Sun, 23 Aug 2020 16:03:34 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Kyle Huey <me@...ehuey.com>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        "Robert O'Callahan" <rocallahan@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        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>,
        Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: Re: [PATCH v2 2/8] x86/debug: Sync BTF earlier

On Fri, Aug 21, 2020 at 3:21 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> Move the BTF sync near the DR6 load, as this will be the only common
> code guaranteed to run on every #DB.

I don't think this code is strictly correct, but I think your change is
still an improvement.

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