From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB284C10F13 for ; Thu, 11 Apr 2019 09:56:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94C82218AF for ; Thu, 11 Apr 2019 09:56:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726902AbfDKJ4K (ORCPT ); Thu, 11 Apr 2019 05:56:10 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:39222 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725783AbfDKJ4J (ORCPT ); Thu, 11 Apr 2019 05:56:09 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E81FE374; Thu, 11 Apr 2019 02:56:08 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F17F73F59C; Thu, 11 Apr 2019 02:56:05 -0700 (PDT) Date: Thu, 11 Apr 2019 10:55:43 +0100 From: Mark Rutland To: Alexey Kardashevskiy Cc: Daniel Jordan , akpm@linux-foundation.org, Alan Tull , Alex Williamson , Benjamin Herrenschmidt , Christoph Lameter , Davidlohr Bueso , Michael Ellerman , Moritz Fischer , Paul Mackerras , Wu Hao , linux-mm@kvack.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/6] mm: change locked_vm's type from unsigned long to atomic64_t Message-ID: <20190411095543.GA55197@lakrids.cambridge.arm.com> References: <20190402204158.27582-1-daniel.m.jordan@oracle.com> <20190402204158.27582-2-daniel.m.jordan@oracle.com> <614ea07a-dd1e-2561-b6f4-2d698bf55f5b@ozlabs.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <614ea07a-dd1e-2561-b6f4-2d698bf55f5b@ozlabs.ru> User-Agent: Mutt/1.11.1+11 (2f07cb52) (2018-12-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 11, 2019 at 02:22:23PM +1000, Alexey Kardashevskiy wrote: > On 03/04/2019 07:41, Daniel Jordan wrote: > > - dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %ld/%ld%s\n", current->pid, > > + dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %lld/%lu%s\n", current->pid, > > incr ? '+' : '-', npages << PAGE_SHIFT, > > - current->mm->locked_vm << PAGE_SHIFT, rlimit(RLIMIT_MEMLOCK), > > - ret ? "- exceeded" : ""); > > + (s64)atomic64_read(¤t->mm->locked_vm) << PAGE_SHIFT, > > + rlimit(RLIMIT_MEMLOCK), ret ? "- exceeded" : ""); > > > > atomic64_read() returns "long" which matches "%ld", why this change (and > similar below)? You did not do this in the two pr_debug()s above anyway. Unfortunately, architectures return inconsistent types for atomic64 ops. Some return long (e..g. powerpc), some return long long (e.g. arc), and some return s64 (e.g. x86). I'm currently trying to clean things up so that all use s64 [1], but in the mean time it's necessary for generic code use a cast or temporarly variable to ensure a consistent type. Once that's cleaned up, we can remove the redundant casts. Thanks, Mark. [1] https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=atomics/type-cleanup