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

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Message-ID: <20200302222500.GA25705@lenoir>
Date:   Mon, 2 Mar 2020 23:25:01 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, 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 Tue, Feb 25, 2020 at 11:16:08PM +0100, 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.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Frederic Weisbecker <frederic@...nel.org>