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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 2DF4BC4361A for ; Tue, 2 Mar 2021 13:46:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7ACE64F40 for ; Tue, 2 Mar 2021 13:46:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1447713AbhCBNmv (ORCPT ); Tue, 2 Mar 2021 08:42:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:49010 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350701AbhCBMXv (ORCPT ); Tue, 2 Mar 2021 07:23:51 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C9EB564FB0; Tue, 2 Mar 2021 11:58:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614686338; bh=kKPXFGmocRgAyVULV6u78ddVNab1ZnkopxxC8LH//7w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sMOB65a2pkLjiD/V58IRBwC6DZsMWgyQtwHRCnx3k+Paftt/HFr4K6c4I5vxqqNbf cZjEQtfmi/JOz79nvGngEP5hEgLXt9jb6aZh00j8qVea7tIYBWIkGierSAuf/j43ZK 9CcwNEBGDQ+iqxMSQ3hiZRM7+1QTkJ19ADQ8+e6URJi3wasvSLpJ8cRq35s8x/saEC vh+3UwIya3R2AqQXyKhrYM9gJsKj5KMwU/RIJs/bQMKDKaDfFjkZ+JSIyl1sB6lPVm cHfmlxHRHotFtxJ6B8mj92lIVz8pb62T9JjUhpHD3/FxcdHatwT6alN2vh7vwHIaVK mvpTSJlrCtcNg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Heiko Carstens , Vasily Gorbik , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 18/21] s390/smp: __smp_rescan_cpus() - move cpumask away from stack Date: Tue, 2 Mar 2021 06:58:32 -0500 Message-Id: <20210302115835.63269-18-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210302115835.63269-1-sashal@kernel.org> References: <20210302115835.63269-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Heiko Carstens [ Upstream commit 62c8dca9e194326802b43c60763f856d782b225c ] Avoid a potentially large stack frame and overflow by making "cpumask_t avail" a static variable. There is no concurrent access due to the existing locking. Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- arch/s390/kernel/smp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index c47bd581a08a..bce678c7179c 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -751,7 +751,7 @@ static int smp_add_core(struct sclp_core_entry *core, cpumask_t *avail, static int __smp_rescan_cpus(struct sclp_core_info *info, bool early) { struct sclp_core_entry *core; - cpumask_t avail; + static cpumask_t avail; bool configured; u16 core_id; int nr, i; -- 2.30.1