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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 7DAACC43331 for ; Thu, 26 Mar 2020 22:24:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 493992077D for ; Thu, 26 Mar 2020 22:24:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JTMMyrGu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727611AbgCZWYw (ORCPT ); Thu, 26 Mar 2020 18:24:52 -0400 Received: from mail-wm1-f68.google.com ([209.85.128.68]:32791 "EHLO mail-wm1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726270AbgCZWYv (ORCPT ); Thu, 26 Mar 2020 18:24:51 -0400 Received: by mail-wm1-f68.google.com with SMTP id w25so5845606wmi.0 for ; Thu, 26 Mar 2020 15:24:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=FAoCzyrdY1LBflFj0Bs5Q8Nrdecy48mQMVZ+2E8qNH8=; b=JTMMyrGuyHsBCTErKJAGpX8ivePahwROd1sXO3axLXyvZ1H/EicEtW8tGyy6iEccrT xVHFhx2L738y23EtcpvAwXwcxoYCGbsFPGCAwqsqcHaEYyX43djUDNyrOSMf0TXuBqj9 3+TDxxOQjrNCUrH7nRTTq3+SgsvI1pErv2nFd1z4lz69U27kiOKUsTpGq4varX++wjLl mfV+plZAc3strnoQy3zPzdtW7HcqrhX24rUDnvr2UV2r97tB7iWtbPPMfrLLs7o02lq9 BqWuP9cIuCELntO8AV2KfsDsaL07eOudrJP9WEJOmDLRg0j5AFE4QBuUkptVOZgpxrNt 13mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=FAoCzyrdY1LBflFj0Bs5Q8Nrdecy48mQMVZ+2E8qNH8=; b=mLPsBmUpJ+rIL6q7r4PaNCBR4gmxj6o5fCNdCzaYZDnIIfC+t649FOL1xVTVeUMZ54 3QwgTyjNNYs1V1uKNrMYEI+YxOjS+aNY5Ooj+vuQ2FvidaCXUYPm5SXTEnPm4LhOZY6P +q53y37XDqc610ikHoQUO7C9dWjjxcw3lryCqqL9Y8EzLHeekhB0RWFJlM6czhP4xWf9 SEP3AUVnWq7CB5X/hxGQdIVm6Nu/8q+unFFSr7oYIsHj16tVlmMLYYrNSHfMBjJcIMfc /CvZ2YJFJckMKuyWT/GGIPsUcQHWkBNh7G3bKg5cx8JhoGx1tE0naUSNvp7C+0bZ2k63 eEyA== X-Gm-Message-State: ANhLgQ2jB5zIXIG4n+WROho0ZTP3tP9HaNRz7MSSLnBC8A3Wt+zR48M8 DS3YtcqH8vvJOqPEZKW0L3A= X-Google-Smtp-Source: ADFU+vvMyEi9mdN1lTnZ9Kt/xM9PP20O2+s0UWDof1+uc8SqBbmOdoNH86tbnHs9mktJhDxjnt+Qrg== X-Received: by 2002:a1c:cc0a:: with SMTP id h10mr2063353wmb.127.1585261488638; Thu, 26 Mar 2020 15:24:48 -0700 (PDT) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id s15sm5506680wrt.16.2020.03.26.15.24.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 26 Mar 2020 15:24:48 -0700 (PDT) From: Wei Yang To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [PATCH 1/2] mm/page_alloc.c: leverage compiler to zero out used_mask Date: Thu, 26 Mar 2020 22:24:44 +0000 Message-Id: <20200326222445.18781-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since we always clear used_mask before getting node order, we can leverage compiler to do this instead of at run time. Signed-off-by: Wei Yang --- mm/page_alloc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0e823bca3f2f..2144b6ceb119 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5587,14 +5587,13 @@ static void build_zonelists(pg_data_t *pgdat) { static int node_order[MAX_NUMNODES]; int node, load, nr_nodes = 0; - nodemask_t used_mask; + nodemask_t used_mask = {.bits = {0}}; int local_node, prev_node; /* NUMA-aware ordering of nodes */ local_node = pgdat->node_id; load = nr_online_nodes; prev_node = local_node; - nodes_clear(used_mask); memset(node_order, 0, sizeof(node_order)); while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { -- 2.23.0