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([2601:646:c200:1ef2:3602:86ff:fef6:e86b]) by smtp.googlemail.com with ESMTPSA id o6sm938967pgg.37.2020.02.25.21.52.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Feb 2020 21:52:53 -0800 (PST) Subject: Re: [patch 02/24] x86/entry/64: Avoid pointless code when CONTEXT_TRACKING=n To: Thomas Gleixner , LKML Cc: x86@kernel.org, Steven Rostedt , Brian Gerst , Juergen Gross , Paolo Bonzini , Arnd Bergmann References: <20200225221606.511535280@linutronix.de> <20200225222648.395059616@linutronix.de> From: Andy Lutomirski Message-ID: <4ef1253a-1572-d523-3e78-2fe2e579b4ca@kernel.org> Date: Tue, 25 Feb 2020 21:52:51 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200225222648.395059616@linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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