From nobody Fri Dec 19 07:47:17 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5A58C4167B for ; Thu, 7 Dec 2023 13:17:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232746AbjLGNRn (ORCPT ); Thu, 7 Dec 2023 08:17:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229949AbjLGNRl (ORCPT ); Thu, 7 Dec 2023 08:17:41 -0500 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BFD96D54 for ; Thu, 7 Dec 2023 05:17:47 -0800 (PST) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1d05e4a94c3so7696155ad.1 for ; Thu, 07 Dec 2023 05:17:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1701955067; x=1702559867; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=u7Lgx3Zbpr1E7puAaYjXgpPZvKd9rN9LGgZ0ZOsq1+M=; b=GXzrMIBNsXeA4G1rieHucgy47+6kgaErRTdQYsRogE2IAb5ZNjtc3xWxlFibx/WO4M nuA1/aRbi/GILanQgYGxUW4MHyrJyrASpS1sP4BR2vYLFg21UEjJewCiagzT5QEPSMHg 5+bx6iQabkwQcIQnrr6Jpu49t3q4UKAr4OWrVIZQ7htOiT/vVlbg0/hNXpBTpAqYCCWA zpnvmhW/Q2ovvdLGC9dFlCFnbf5T3RZ/nu7QUXbX3GszrfBltnw3v/lDBP9R7d9RlfO2 eLr6kLzCbCWjDWxVDRo+4xP+C9vqWt0E2Bg2LDM4FIEtAFJtB5MfIa/J4tXtQczMCKUW ZRIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701955067; x=1702559867; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=u7Lgx3Zbpr1E7puAaYjXgpPZvKd9rN9LGgZ0ZOsq1+M=; b=SQvhUgA9/4nJ1P4Re80Y5GOfhcZWNccBRmKW2DoErIZLcRZzpqp8QNH1AG3sJgrYU0 8FZF6Uz8VajJBO+VT6rg0vXMQgM5UBW7v8R1oY747aIfKyoNJAcBj8gkgFRz3m9ZT1oe SSGkPlgAw9ujIGEHVLIJ6I9zyNFZKiVroKzelh6NFrL+HIvtpCnK+4j1IjggrTbjwJVn etH8eh35C7sqU5JE7jLojYn4sl5dxCC3z4B1OXkx+3y64xYBZrYNNoepbmfL38CXY4Pm g9/TvTNP8IU81VmiAjpwRFuza2FDJlnNrU3jfYNoYFJYTqNY258lRX+4qwTyuhi9/m5M vK6g== X-Gm-Message-State: AOJu0YzkVFjvYoDbF8X2KPQRThXo45a4fcC5KXj31gOEpa6keik1vrh/ EBgOowWzje9z80qeqmE1UHaAgDrs3kA= X-Google-Smtp-Source: AGHT+IEwweuOJxA+9KyMUlZKgSvo80ecjWIIvp0YhzoQ4rCreecj9kBIUFe5CA6HRimihnqGwZlLNA== X-Received: by 2002:a17:902:e88f:b0:1d0:6b95:9c0d with SMTP id w15-20020a170902e88f00b001d06b959c0dmr3370212plg.65.1701955066960; Thu, 07 Dec 2023 05:17:46 -0800 (PST) Received: from code.. ([144.202.108.46]) by smtp.gmail.com with ESMTPSA id z2-20020a170902ee0200b001d071a305ecsm1365213plb.245.2023.12.07.05.17.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Dec 2023 05:17:45 -0800 (PST) From: Yuntao Wang To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Yuntao Wang Subject: [PATCH] x86/mm: Optimize the for loop in numa_nodemask_from_meminfo() Date: Thu, 7 Dec 2023 21:16:58 +0800 Message-ID: <20231207131658.225815-1-ytcoode@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Since only the first `mi->nr_blks` elements of the `mi->blk` array contain valid data, we do not need to iterate over the entire array. Signed-off-by: Yuntao Wang --- arch/x86/mm/numa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index b29ceb19e46e..e84f14a9462d 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -339,7 +339,7 @@ static void __init numa_nodemask_from_meminfo(nodemask_= t *nodemask, { int i; =20 - for (i =3D 0; i < ARRAY_SIZE(mi->blk); i++) + for (i =3D 0; i < mi->nr_blks; i++) if (mi->blk[i].start !=3D mi->blk[i].end && mi->blk[i].nid !=3D NUMA_NO_NODE) node_set(mi->blk[i].nid, *nodemask); --=20 2.43.0