From nobody Fri Dec 19 18:41:32 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 4835BECAAA1 for ; Mon, 24 Oct 2022 13:21:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235920AbiJXNVj (ORCPT ); Mon, 24 Oct 2022 09:21:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236403AbiJXNUW (ORCPT ); Mon, 24 Oct 2022 09:20:22 -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 BB30A1A20D; Mon, 24 Oct 2022 05:29:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BA4C061314; Mon, 24 Oct 2022 12:17:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBE36C433C1; Mon, 24 Oct 2022 12:17:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666613850; bh=uBbLc8QAgT9cQGnph4PMHqBIqShqWIcTjog/nTwhBok=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xAzQ9259mo7XcfnjvBhTCwnQQE8lO8k6Wr1tA+xKsXNA6KBTyfCrO45mtaoO3YvoW TCPjbme9MqNpSlmDwfHM31cmYBtfD1IQVP69z1CkHl/I4wAB9gEwqIblUMN3r1ph2U UcJQRCksfTlz3o6Op25FUxp83KX2MLeAudt2Rtro= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Huacai Chen , Richard Weinberger Subject: [PATCH 5.10 037/390] UM: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK Date: Mon, 24 Oct 2022 13:27:14 +0200 Message-Id: <20221024113024.190058996@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113022.510008560@linuxfoundation.org> References: <20221024113022.510008560@linuxfoundation.org> User-Agent: quilt/0.67 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" From: Huacai Chen commit 16c546e148fa6d14a019431436a6f7b4087dbccd upstream. When CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS is selected, cpu_max_bits_warn() generates a runtime warning similar as below while we show /proc/cpuinfo. Fix this by using nr_cpu_ids (the runtime limit) instead of NR_CPUS to iterate CPUs. [ 3.052463] ------------[ cut here ]------------ [ 3.059679] WARNING: CPU: 3 PID: 1 at include/linux/cpumask.h:108 show_c= puinfo+0x5e8/0x5f0 [ 3.070072] Modules linked in: efivarfs autofs4 [ 3.076257] CPU: 0 PID: 1 Comm: systemd Not tainted 5.19-rc5+ #1052 [ 3.099465] Stack : 9000000100157b08 9000000000f18530 9000000000cf846c 9= 000000100154000 [ 3.109127] 9000000100157a50 0000000000000000 9000000100157a58 9= 000000000ef7430 [ 3.118774] 90000001001578e8 0000000000000040 0000000000000020 f= fffffffffffffff [ 3.128412] 0000000000aaaaaa 1ab25f00eec96a37 900000010021de80 9= 00000000101c890 [ 3.138056] 0000000000000000 0000000000000000 0000000000000000 0= 000000000aaaaaa [ 3.147711] ffff8000339dc220 0000000000000001 0000000006ab4000 0= 000000000000000 [ 3.157364] 900000000101c998 0000000000000004 9000000000ef7430 0= 000000000000000 [ 3.167012] 0000000000000009 000000000000006c 0000000000000000 0= 000000000000000 [ 3.176641] 9000000000d3de08 9000000001639390 90000000002086d8 0= 0007ffff0080286 [ 3.186260] 00000000000000b0 0000000000000004 0000000000000000 0= 000000000071c1c [ 3.195868] ... [ 3.199917] Call Trace: [ 3.203941] [<90000000002086d8>] show_stack+0x38/0x14c [ 3.210666] [<9000000000cf846c>] dump_stack_lvl+0x60/0x88 [ 3.217625] [<900000000023d268>] __warn+0xd0/0x100 [ 3.223958] [<9000000000cf3c90>] warn_slowpath_fmt+0x7c/0xcc [ 3.231150] [<9000000000210220>] show_cpuinfo+0x5e8/0x5f0 [ 3.238080] [<90000000004f578c>] seq_read_iter+0x354/0x4b4 [ 3.245098] [<90000000004c2e90>] new_sync_read+0x17c/0x1c4 [ 3.252114] [<90000000004c5174>] vfs_read+0x138/0x1d0 [ 3.258694] [<90000000004c55f8>] ksys_read+0x70/0x100 [ 3.265265] [<9000000000cfde9c>] do_syscall+0x7c/0x94 [ 3.271820] [<9000000000202fe4>] handle_syscall+0xc4/0x160 [ 3.281824] ---[ end trace 8b484262b4b8c24c ]--- Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen Signed-off-by: Richard Weinberger Signed-off-by: Greg Kroah-Hartman --- arch/um/kernel/um_arch.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -77,7 +77,7 @@ static int show_cpuinfo(struct seq_file =20 static void *c_start(struct seq_file *m, loff_t *pos) { - return *pos < NR_CPUS ? cpu_data + *pos : NULL; + return *pos < nr_cpu_ids ? cpu_data + *pos : NULL; } =20 static void *c_next(struct seq_file *m, void *v, loff_t *pos)