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

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Message-ID: <b18b0575-c80e-4842-546a-83d7147bb809@oracle.com>
Date:   Fri, 28 Feb 2020 10:40:14 +0100
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
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 11:16 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.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   arch/x86/entry/entry_64.S |    2 ++
>   1 file changed, 2 insertions(+)
> 

Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>

alex.