linux-kernel - Re: [PATCH] x86/debug: Allow a single level of #DB recursion

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Date:   Thu, 20 Aug 2020 10:44:27 +0200
From:   peterz@...radead.org
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, Kyle Huey <me@...ehuey.com>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Robert O'Callahan <rocallahan@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "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>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Will Deacon <will@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH] x86/debug: Allow a single level of #DB recursion

On Wed, Aug 19, 2020 at 05:15:43PM -0700, Andy Lutomirski wrote:
> +static __always_inline void debug_enter(unsigned long *dr6, unsigned long *dr7)
> +{
> +	*dr6 = debug_read_clear_dr6();
>  }
>  
>  static __always_inline void debug_exit(unsigned long dr7)
>  {
> -	local_db_restore(dr7);
>  }

That's all unused after this patch, might as well remove it.