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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 7348BC43441 for ; Fri, 23 Nov 2018 23:44:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3353420861 for ; Fri, 23 Nov 2018 23:44:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3353420861 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-block-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727944AbeKXKae (ORCPT ); Sat, 24 Nov 2018 05:30:34 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:44132 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727607AbeKXKae (ORCPT ); Sat, 24 Nov 2018 05:30:34 -0500 Received: from localhost.localdomain (c-24-6-170-16.hsd1.ca.comcast.net [24.6.170.16]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 3B646415; Fri, 23 Nov 2018 23:44:17 +0000 (UTC) Date: Fri, 23 Nov 2018 15:44:15 -0800 From: Andrew Morton To: Anshuman Khandual Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-media@vger.kernel.org, iommu@lists.linux-foundation.org, linux-rdma@vger.kernel.org, dmaengine@vger.kernel.org, linux-block@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-ia64@vger.kernel.org, linux-alpha@vger.kernel.org, jiangqi903@gmail.com, hverkuil@xs4all.nl Subject: Re: [PATCH] mm: Replace all open encodings for NUMA_NO_NODE Message-Id: <20181123154415.42898a42e28a31488749738a@linux-foundation.org> In-Reply-To: <1542966856-12619-1-git-send-email-anshuman.khandual@arm.com> References: <1542966856-12619-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Fri, 23 Nov 2018 15:24:16 +0530 Anshuman Khandual wrote: > At present there are multiple places where invalid node number is encoded > as -1. Even though implicitly understood it is always better to have macros > in there. Replace these open encodings for an invalid node number with the > global macro NUMA_NO_NODE. This helps remove NUMA related assumptions like > 'invalid node' from various places redirecting them to a common definition. > > ... > > Build tested this with multiple cross compiler options like alpha, sparc, > arm64, x86, powerpc, powerpc64le etc with their default config which might > not have compiled tested all driver related changes. I will appreciate > folks giving this a test in their respective build environment. > > All these places for replacement were found by running the following grep > patterns on the entire kernel code. Please let me know if this might have > missed some instances. This might also have replaced some false positives. > I will appreciate suggestions, inputs and review. > > 1. git grep "nid == -1" > 2. git grep "node == -1" > 3. git grep "nid = -1" > 4. git grep "node = -1" The build testing is good, but I worry that some of the affected files don't clearly have numa.h in their include paths, for the NUMA_NO_NODE definition. The first thing I looked it is arch/powerpc/include/asm/pci-bridge.h. Maybe it somehow manages to include numa.h via some nested include, but if so, is that reliable across all config combinations and as code evolves? So I think that the patch should have added an explicit include of numa.h, especially in cases where the affected file previously had no references to any of the things which numa.h defines.