From patchwork Thu Sep 8 12:55:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 75788 Delivered-To: patch@linaro.org Received: by 10.140.106.11 with SMTP id d11csp830898qgf; Thu, 8 Sep 2016 06:00:41 -0700 (PDT) X-Received: by 10.98.75.156 with SMTP id d28mr26537247pfj.48.1473339641315; Thu, 08 Sep 2016 06:00:41 -0700 (PDT) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id lu15si46953441pab.140.2016.09.08.06.00.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Sep 2016 06:00:41 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bhyv9-0004c7-OV; Thu, 08 Sep 2016 12:59:11 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bhysg-0002vT-Lo for linux-arm-kernel@lists.infradead.org; Thu, 08 Sep 2016 12:56:42 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 55D1D1534; Thu, 8 Sep 2016 05:56:12 -0700 (PDT) Received: from leverpostej.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 12A6D3F2E5; Thu, 8 Sep 2016 05:56:10 -0700 (PDT) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 6/6] arm64: simplify contextidr_thread_switch Date: Thu, 8 Sep 2016 13:55:39 +0100 Message-Id: <1473339339-32334-7-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1473339339-32334-1-git-send-email-mark.rutland@arm.com> References: <1473339339-32334-1-git-send-email-mark.rutland@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160908_055639_056218_66247AD2 X-CRM114-Status: UNSURE ( 9.45 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -8.3 (--------) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-8.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [217.140.101.70 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, robin.murphy@arm.com, christoffer.dall@linaro.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org When CONFIG_PID_IN_CONTEXTIDR is not selected, we use an empty stub definition of contextidr_thread_switch(). As everything we rely upon exists regardless of CONFIG_PID_IN_CONTEXTIDR, we don't strictly require an empty stub. By using IS_ENABLED() rather than ifdeffery, we avoid duplication, and get compiler coverage on all the code even when CONFIG_PID_IN_CONTEXTIDR is not selected and the code is optimised away. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Will Deacon --- arch/arm64/include/asm/mmu_context.h | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index e5c24b4..a501853 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -30,17 +30,14 @@ #include #include -#ifdef CONFIG_PID_IN_CONTEXTIDR static inline void contextidr_thread_switch(struct task_struct *next) { + if (!IS_ENABLED(CONFIG_PID_IN_CONTEXTIDR)) + return; + write_sysreg(task_pid_nr(next), contextidr_el1); isb(); } -#else -static inline void contextidr_thread_switch(struct task_struct *next) -{ -} -#endif /* * Set TTBR0 to empty_zero_page. No translations will be possible via TTBR0.