From patchwork Mon Jun 23 03:11:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Lynch X-Patchwork-Id: 4399241 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 86C259F390 for ; Mon, 23 Jun 2014 03:19:13 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C30D02024F for ; Mon, 23 Jun 2014 03:19:12 +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 DE12020268 for ; Mon, 23 Jun 2014 03:19:11 +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 1Wyujw-0004KS-Ns; Mon, 23 Jun 2014 03:16:16 +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 1WyugU-00009F-Jp for linux-arm-kernel@lists.infradead.org; Mon, 23 Jun 2014 03:12:43 +0000 Received: from svr-orw-exc-10.mgc.mentorg.com ([147.34.98.58]) by relay1.mentorg.com with esmtp id 1WyugA-00002Z-7u from Nathan_Lynch@mentor.com ; Sun, 22 Jun 2014 20:12:22 -0700 Received: from SVR-ORW-FEM-03.mgc.mentorg.com ([147.34.97.39]) by SVR-ORW-EXC-10.mgc.mentorg.com with Microsoft SMTPSVC(6.0.3790.4675); Sun, 22 Jun 2014 20:12:22 -0700 Received: from localhost (147.34.91.1) by SVR-ORW-FEM-03.mgc.mentorg.com (147.34.97.39) with Microsoft SMTP Server (TLS) id 14.2.247.3; Sun, 22 Jun 2014 20:12:21 -0700 From: Nathan Lynch To: Subject: [PATCH v7 9/9] ARM: add CONFIG_VDSO Kconfig and Makefile bits Date: Sun, 22 Jun 2014 22:11:58 -0500 Message-ID: <1403493118-7597-10-git-send-email-nathan_lynch@mentor.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1403493118-7597-1-git-send-email-nathan_lynch@mentor.com> References: <1403493118-7597-1-git-send-email-nathan_lynch@mentor.com> MIME-Version: 1.0 X-OriginalArrivalTime: 23 Jun 2014 03:12:22.0071 (UTC) FILETIME=[F305C470:01CF8E90] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140622_201242_772130_EB626B7E X-CRM114-Status: UNSURE ( 9.56 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.0 (/) Cc: steve.capper@linaro.org, ard.biesheuvel@linaro.org, will.deacon@arm.com, sboyd@codeaurora.org, keescook@google.com, linux@arm.linux.org.uk 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=-1.9 required=5.0 tests=BAYES_00, T_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. Signed-off-by: Nathan Lynch --- arch/arm/kernel/Makefile | 1 + arch/arm/mm/Kconfig | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 38ddd9f83d0e..87d4cdc3f3f9 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 vdso/ ifneq ($(CONFIG_ARCH_EBSA110),y) obj-y += io.o diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index eda0dd0ab97b..616f46794502 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 2.20 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