From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 101494 invoked by alias); 17 Aug 2016 12:48:54 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Received: (qmail 101477 invoked by uid 89); 17 Aug 2016 12:48:53 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=aarch32, Hx-languages-length:1606, H*Ad:D*pl, percent X-HELO: NAM03-CO1-obe.outbound.protection.outlook.com Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Yuri.Norov@caviumnetworks.com; Date: Wed, 17 Aug 2016 12:48:00 -0000 From: Yury Norov To: Alexander Graf CC: Arnd Bergmann , Catalin Marinas , linux-arm-kernel , LKML , , , , Martin Schwidefsky , , , , , , , , , , , , , , , , , , , Subject: Re: [RFC2 nowrap: PATCH v7 00/18] ILP32 for ARM64 Message-ID: <20160817124822.GA25751@yury-N73SV> References: <1471434403-25291-1-git-send-email-ynorov@caviumnetworks.com> <175AE090-EDA7-4A8D-9044-3FFA74AC1903@suse.de> MIME-Version: 1.0 Content-Type: text/plain; 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In this patchset, w0-w7 are cleared for each > > syscall in assembler entry. The alternative approach is in introducing compat > > wrappers which is little faster for natively routed syscalls (~2.6% for syscall > > with no payload) but much more complicated. > > So you’re saying there are 2 options: > > 1) easy to get right, slightly slower, same ABI to user space as 2 > 2) harder to get right, minor performance benefit No, ABI is little different. If 1) we pass off_t in a pair to syscalls, if 2) - in a single register. So if 1, we 'd take some wrappers from aarch32. See patch 12 here. > That’s an obvious pick, no? Mark it non-RFC and stay with the clearing in assembler entry. If anyone cares about those last few percent, they can still push the harder path upstream later if they want to, but at least we’ll have the ABI stable, so that you can start using and developing for ilp32 on aarch64. > > > Alex