From patchwork Sat Aug 2 18:16:47 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Lynch X-Patchwork-Id: 4665301 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 19EF39F36A for ; Sat, 2 Aug 2014 18:21:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0A7B82015E for ; Sat, 2 Aug 2014 18:21:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 285CC2011D for ; Sat, 2 Aug 2014 18:21:24 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XDdsy-000270-UF; Sat, 02 Aug 2014 18:18:28 +0000 Received: from relay1.mentorg.com ([192.94.38.131]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XDds2-0001Mq-Vv for linux-arm-kernel@lists.infradead.org; Sat, 02 Aug 2014 18:17:31 +0000 Received: from svr-orw-exc-10.mgc.mentorg.com ([147.34.98.58]) by relay1.mentorg.com with esmtp id 1XDdrk-0004l1-0Q from Nathan_Lynch@mentor.com ; Sat, 02 Aug 2014 11:17:12 -0700 Received: from SVR-ORW-FEM-02.mgc.mentorg.com ([147.34.96.206]) by SVR-ORW-EXC-10.mgc.mentorg.com with Microsoft SMTPSVC(6.0.3790.4675); Sat, 2 Aug 2014 11:17:11 -0700 Received: from localhost (147.34.91.1) by SVR-ORW-FEM-02.mgc.mentorg.com (147.34.96.168) with Microsoft SMTP Server (TLS) id 14.2.247.3; Sat, 2 Aug 2014 11:16:18 -0700 From: Nathan Lynch To: Russell King Subject: [PATCH v8 10/10] ARM: add CONFIG_VDSO Kconfig and Makefile bits Date: Sat, 2 Aug 2014 13:16:47 -0500 Message-ID: <1407003407-31219-11-git-send-email-nathan_lynch@mentor.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1407003407-31219-1-git-send-email-nathan_lynch@mentor.com> References: <1407003407-31219-1-git-send-email-nathan_lynch@mentor.com> MIME-Version: 1.0 X-OriginalArrivalTime: 02 Aug 2014 18:17:11.0876 (UTC) FILETIME=[FACA9840:01CFAE7D] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140802_111731_048605_F8D630E9 X-CRM114-Status: GOOD ( 11.03 ) X-Spam-Score: -0.0 (/) Cc: Steve Capper , Kees Cook , Arnd Bergmann , Ard Biesheuvel , Will Deacon , Daniel Lezcano , Stephen Boyd , Andy Lutomirski , Jan Glauber , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Allow users to enable the vdso in Kconfig; include the vdso in the build if CONFIG_VDSO is enabled. Add 'vdso_install' target. Signed-off-by: Nathan Lynch --- arch/arm/Makefile | 8 ++++++++ arch/arm/kernel/Makefile | 1 + arch/arm/mm/Kconfig | 15 +++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 0ce9d0f71f2a..109c011ef4ed 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -264,6 +264,7 @@ core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ) core-$(CONFIG_VFP) += arch/arm/vfp/ core-$(CONFIG_XEN) += arch/arm/xen/ core-$(CONFIG_KVM_ARM_HOST) += arch/arm/kvm/ +core-$(CONFIG_VDSO) += arch/arm/vdso/ # If we have a machine-specific directory, then include it in the build. core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ @@ -316,6 +317,12 @@ PHONY += dtbs dtbs_install dtbs dtbs_install: prepare scripts $(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $@ +PHONY += vdso_install +vdso_install: +ifeq ($(CONFIG_VDSO),y) + $(Q)$(MAKE) $(build)=arch/arm/vdso $@ +endif + # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) @@ -340,4 +347,5 @@ define archhelp echo ' Install using (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH) and run lilo' + echo ' vdso_install - Install unstripped vdso.so to $$(INSTALL_MOD_PATH)/vdso' endef diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 38ddd9f83d0e..3e2b80658344 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -86,6 +86,7 @@ obj-$(CONFIG_PERF_EVENTS) += perf_regs.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o +obj-$(CONFIG_VDSO) += vdso.o ifneq ($(CONFIG_ARCH_EBSA110),y) obj-y += io.o diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index ae69809a9e47..c256323040d6 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -824,6 +824,21 @@ config KUSER_HELPERS Say N here only if you are absolutely certain that you do not need these helpers; otherwise, the safe option is to say Y. +config VDSO + bool "Enable vDSO for acceleration of some system calls" + depends on AEABI && MMU + default y if ARM_ARCH_TIMER + select GENERIC_TIME_VSYSCALL + help + Place in the process address space an ELF shared object + providing fast implementations of several system calls, + including gettimeofday and clock_gettime. Systems that + implement the ARM architected timer will receive maximum + benefit. + + You must have glibc 2.21 or later for programs to seamlessly + take advantage of this. + config DMA_CACHE_RWFO bool "Enable read/write for ownership DMA cache maintenance" depends on CPU_V6K && SMP