From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2056830-1525128473-2-10071765606020894382 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1525128472; b=TzV0yPdXBVhBTtsTpoOowson9dXR3KwuLg/vmwPE1UBF4TCrJq BMKMyWad8rru4sOZnYl5WSBLEhXwenSKolBbm9sxStsWcaSVUUkfjLJNz3kBC/Tk Vl/BIFQzzvHREGGv8sJYN6o4P3cFvq7aunnRDZ8KhZ/lNJLDdbxsFPyQUW+9NvdY ATEGP/NbTDWqEqCBUwnilIXw7hmOeeDzvTs7w8y2fPSQuF0LV/AOLCGz7g8Q7lQE hhhNKxhpsQJ366ZFYU19LB2ca96LEHAZZwko94wbliTzmeb0i/isALJzAPau0pLT /OboAZEjJCB0Rm/zbhP0+HU6unzoEnBs24ig== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=fm2; t=1525128472; bh= uS06LarinKMA7Z7yWjK4Sigx5XGJhTypSg+kiwdAlqc=; b=lk+zshPfgvCqckIc CsMbjP/4xmBuadFwzQSb4JrjVEstjOlfqp4/jEOVu+T4pPRJRcbC4DnGC+7Mc8S4 +z9y+KGxkA9kJcz8PI937jkSFTedBLN0zq9YOaz2QFfrMzKka3nt77wVRS2/GIK3 rFR928z12BDY5PVVJELgPiRyAEsoG7U4uUdAP9vPb0ZvkweIhtv78f7ZeSnYi75X qli1VWbhFFTrwVl+f9jZeh1LMSO6FjDDSPqTBa9Y3S8Jq4LXEMS8pTnI/bYHC1Sb UlbIR9XVH9C0VCritOsbYILR4kT2fQ9Hq7Zf+UjMq+AvUXSEo636BzrSAwocQeHK yheoqA== ARC-Authentication-Results: i=1; mx6.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=efficios.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=efficios.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx6.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=efficios.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=efficios.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfJDCaGuV1nKgOa2yJm8SU/QivHcCKbozs3DXo4VGjfyewVGinlb4H/3BVOdMqjHrB/1y7lfjK5Qc0+z5Zz4Mm92sekGu7xdDv8M1UUtw92a/n+bz0Ju+ gkZUQle0ltAapdUahPO0jTq2vTWOTaDUAEWn7eW98u6/gD7wGo4PJ+a27ol6J7tzwLsgXjHmP6fzjway9ca+jJrOuDNciQVYGF9reypNsuZMx1LuIM1bXLJX X-CM-Analysis: v=2.3 cv=FKU1Odgs c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=Kd1tUaAdevIA:10 a=7d_E57ReAAAA:8 a=drOt6m5kAAAA:8 a=7CQSdrXTAAAA:8 a=1XWaLZrsAAAA:8 a=JfrnYn6hAAAA:8 a=SOq6UgPBAAAA:8 a=WfulkdPnAAAA:8 a=FOH2dFAWAAAA:8 a=NufY4J3AAAAA:8 a=20KFwNOVAAAA:8 a=oGMlB6cnAAAA:8 a=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=UPm3pfgAAAAA:8 a=Z4Rwk6OoAAAA:8 a=pGLkceISAAAA:8 a=VwQbUJbxAAAA:8 a=UyVg9twnpGBeDI6iwygA:9 a=x8gzFH9gYPwA:10 a=jhqOcbufqs7Y1TYCrUUU:22 a=RMMjzBEyIzXRtoq5n5K6:22 a=a-qgeE7W1pNrGK8U0ZQC:22 a=1CNFftbPRP8L7MoqJWF3:22 a=3hv5r9HjGAh9o5iR9qwG:22 a=56QPVbyS4OZCpcuOg7Z9:22 a=i3VuKzQdj-NEYjvDI-p3:22 a=TPcZfFuj8SYsoCJAFAiX:22 a=NdAtdrkLVvyUPsUoGJp4:22 a=2JgSa4NbpEOStq-L5dxp:22 a=uD9XBtlS4o1URY3aiGdj:22 a=HkZW87K1Qel5hWWM3VKY:22 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755660AbeD3WrX (ORCPT ); Mon, 30 Apr 2018 18:47:23 -0400 Received: from mail.efficios.com ([167.114.142.138]:53032 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755416AbeD3Wop (ORCPT ); Mon, 30 Apr 2018 18:44:45 -0400 From: Mathieu Desnoyers To: Peter Zijlstra , "Paul E . McKenney" , Boqun Feng , Andy Lutomirski , Dave Watson Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Paul Turner , Andrew Morton , Russell King , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Andrew Hunter , Andi Kleen , Chris Lameter , Ben Maurer , Steven Rostedt , Josh Triplett , Linus Torvalds , Catalin Marinas , Will Deacon , Michael Kerrisk , Joel Fernandes , Mathieu Desnoyers Subject: [PATCH 06/14] x86: Wire up restartable sequence system call Date: Mon, 30 Apr 2018 18:44:25 -0400 Message-Id: <20180430224433.17407-7-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> References: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Wire up the rseq system call on x86 32/64. This provides an ABI improving the speed of a user-space getcpu operation on x86 by removing the need to perform a function call, "lsl" instruction, or system call on the fast path, as well as improving the speed of user-space operations on per-cpu data. Signed-off-by: Mathieu Desnoyers Reviewed-by: Thomas Gleixner CC: Russell King CC: Catalin Marinas CC: Will Deacon CC: Paul Turner CC: Andrew Hunter CC: Peter Zijlstra CC: Andy Lutomirski CC: Andi Kleen CC: Dave Watson CC: Chris Lameter CC: Ingo Molnar CC: "H. Peter Anvin" CC: Ben Maurer CC: Steven Rostedt CC: "Paul E. McKenney" CC: Josh Triplett CC: Linus Torvalds CC: Andrew Morton CC: Boqun Feng CC: linux-api@vger.kernel.org --- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index d6b27dab1b30..db346da64947 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -396,3 +396,4 @@ 382 i386 pkey_free sys_pkey_free __ia32_sys_pkey_free 383 i386 statx sys_statx __ia32_sys_statx 384 i386 arch_prctl sys_arch_prctl __ia32_compat_sys_arch_prctl +385 i386 rseq sys_rseq __ia32_sys_rseq diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 4dfe42666d0c..41b082b125c3 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -341,6 +341,7 @@ 330 common pkey_alloc __x64_sys_pkey_alloc 331 common pkey_free __x64_sys_pkey_free 332 common statx __x64_sys_statx +333 common rseq __x64_sys_rseq # # x32-specific system call numbers start at 512 to avoid cache impact -- 2.11.0