From nobody Mon Feb 9 03:51:49 2026 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 EB280EB64D8 for ; Wed, 21 Jun 2023 10:15:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230484AbjFUKPH (ORCPT ); Wed, 21 Jun 2023 06:15:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232223AbjFUKPA (ORCPT ); Wed, 21 Jun 2023 06:15:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6DD01170C; Wed, 21 Jun 2023 03:14:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 37CDA61509; Wed, 21 Jun 2023 10:06:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01570C433B9; Wed, 21 Jun 2023 10:05:57 +0000 (UTC) From: Huacai Chen To: Arnd Bergmann , Huacai Chen Cc: loongarch@lists.linux.dev, linux-arch@vger.kernel.org, Xuefeng Li , Guo Ren , Xuerui Wang , Jiaxun Yang , linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn, Huacai Chen Subject: [PATCH] LoongArch: Set CPU#0 as the io master for FDT Date: Wed, 21 Jun 2023 18:05:44 +0800 Message-Id: <20230621100544.109804-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.39.3 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" ACPI systems set io masters by parsing ACPI MADT, FDT systems have no MADT so we explicitly set CPU#0 as the io master. Otherwise CPU#0 will be considered as hotpluggable. Signed-off-by: Huacai Chen --- arch/loongarch/kernel/smp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c index d6dfb4c7ec75..46e611882136 100644 --- a/arch/loongarch/kernel/smp.c +++ b/arch/loongarch/kernel/smp.c @@ -207,6 +207,7 @@ static void __init fdt_smp_setup(void) } =20 loongson_sysconf.nr_cpus =3D num_processors; + set_bit(0, &(loongson_sysconf.cores_io_master)); #endif } =20 --=20 2.39.3