linux-kernel - Re: [patch 02/24] x86/entry/64: Avoid pointless code when CONTEXT

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Message-ID: <4ef1253a-1572-d523-3e78-2fe2e579b4ca@kernel.org>
Date:   Tue, 25 Feb 2020 21:52:51 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 02/24] x86/entry/64: Avoid pointless code when
 CONTEXT_TRACKING=n

On 2/25/20 2:16 PM, Thomas Gleixner wrote:
> GAS cannot optimize out the test and conditional jump when context tracking
> is disabled and CALL_enter_from_user_mode is an empty macro.
> 
> Wrap it in #ifdeffery. Will go away once all this is moved to C.

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