From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-4156032-1522167370-2-9885516869352725823 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 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', 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=arctest; t=1522167366; b=WUerMYMCar4n5/xaRHwVFt4D37dABiXfxBtp5e32PN0oBI0 Bv3B6heDG8Zy5drK6wUvUzBxb6F6ZtbWxpT2NgBmMfMcjWCZiwCeqG0KFWnR38eb +aCuxAV+lR5HL8gT8bS1WS968XXSilVryEl0TbGi3o09BGs4X7nQ9k5vP/j861OS olgCdFLlK2z1draG1EMqkkoDufix18Bdx4BNoie9u5BmtWHypiFXaUZIMZ0W+lNh FbW+0jOhQcej5TzG6d22yWyIRD7bXH4KgxQEwkdn6S8yBV5EumCa+KpnXfypVvKW SjMncl63GryQ3AGCU9407OizhIUHK4h/+ckOVQA== 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=arctest; t=1522167366; bh=/S1NBvuEq2dlSwGkuTsQn8gbMqCfNDp1Cjjaxlrne/A=; b=F6Nyh5gbV7NN 0mvfXbpOLvvq/X4ONhEx62l3Eg++SRSGrd7v/3hY+HeRg1tiHH74RWrZhjM4wsNI 2eVzZFzwRo+2HUAgT1m3kOyxZ8T4Hcv0osDDs7L6Sg86B0EsrcCvOlxMlORjFjXL Y4CNdOwb01qv9ytuWcz20MTBilDwz6eYwk+iVYV89CflyycP+gcOo2u77N+/zzmp S5Qwhkfo8k7b2zcjAcSHDntleWvr16bV59HCTgz28RaojARxaa5OAsOI/2CYWaP9 eFNPPzCM/bc8D2NBOxB/n0Cn5LZqgydPIUuY1Zo5UCq9jpBY+DuDhzwVQbvy+R7x 41ikcmf+OQ== 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: MS4wfBj/UvtQmJ7aXezE+etx5vTIimZJmR014zcwRrmxqFdVS1ASyWi0kHBW8d1dY9d0a7oHeeOMHOlL7OfyR9Qd7dYIuBvrqzJ1pFBX9/JqoUuWV7xoLj8q aBkw+diRSV+Qc55yqR4u/q+f5uZ1aG4qONIENWX/dXP60T6/ursRGDZpcDzcTFWFn3texkWgeGxsZ0PNmoChTCVdylz+aGxKyJTZEZMs9uGhx0JIZ0FS7gKy X-CM-Analysis: v=2.3 cv=FKU1Odgs c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=v2DPQv5-lfwA: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=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=UPm3pfgAAAAA:8 a=Z4Rwk6OoAAAA:8 a=pGLkceISAAAA:8 a=VwQbUJbxAAAA:8 a=nK1Qfd4pxio8lxmWJb4A: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=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 S1751890AbeC0QQF (ORCPT ); Tue, 27 Mar 2018 12:16:05 -0400 Received: from mail.efficios.com ([167.114.142.138]:53324 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751896AbeC0QQA (ORCPT ); Tue, 27 Mar 2018 12:16:00 -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 , Mathieu Desnoyers Subject: [RFC PATCH for 4.17 04/21] arm: Wire up restartable sequences system call Date: Tue, 27 Mar 2018 12:05:25 -0400 Message-Id: <20180327160542.28457-5-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180327160542.28457-1-mathieu.desnoyers@efficios.com> References: <20180327160542.28457-1-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 32-bit ARM. This provides an ABI improving the speed of a user-space getcpu operation on ARM by skipping the getcpu system call on the fast path, as well as improving the speed of user-space operations on per-cpu data compared to using load-linked/store-conditional. Signed-off-by: Mathieu Desnoyers CC: Russell King CC: Catalin Marinas CC: Will Deacon CC: Thomas Gleixner 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: 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/arm/tools/syscall.tbl | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl index 0bb0e9c6376c..fbc74b5fa3ed 100644 --- a/arch/arm/tools/syscall.tbl +++ b/arch/arm/tools/syscall.tbl @@ -412,3 +412,4 @@ 395 common pkey_alloc sys_pkey_alloc 396 common pkey_free sys_pkey_free 397 common statx sys_statx +398 common rseq sys_rseq -- 2.11.0