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 40D34C433E9 for ; Tue, 2 Mar 2021 17:02:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0EEB464EF4 for ; Tue, 2 Mar 2021 17:02:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1579672AbhCBQ7e (ORCPT ); Tue, 2 Mar 2021 11:59:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:46240 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351394AbhCBOWL (ORCPT ); Tue, 2 Mar 2021 09:22:11 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id EDBF864FB3; Tue, 2 Mar 2021 11:59:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614686359; bh=tdEsweCBK+jRRgLHFORyuB/DNrpK71EXPvedRDiL8Qw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uN4guFijRE0/dKdfFZ9dDPo71MMgD9Tc2l2yBhe8PdB9b0cXv6sny0J/u3pY/1JT6 y6ybpqy4iDGJaWeuQz/K1sp1IkRpiQmT1ccWbgTJvpQAPvw9Wzoted1CxIl2rJkDpd /3Cgm9n/EorvlP6RMMD5Szf0dpUMXtX2Ctvtun/QeAUfa/YrnZc80I6Q/T1l3B/r0J QvOdSpJBgddqMdXMTCsRokFgcm2EcX4CAdWS/mtWjimVGh6KtjgV+b1SGWG7A+8E40 Vm/hS/bS4jJhLQqA3CGOxi74Z3eqAPtZ8nnUzrEg/RLWmSSVzX7J/fhwctEWLbdio+ JEqMcCO/X7kYA== 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 4.14 12/13] s390/smp: __smp_rescan_cpus() - move cpumask away from stack Date: Tue, 2 Mar 2021 06:59:02 -0500 Message-Id: <20210302115903.63458-12-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210302115903.63458-1-sashal@kernel.org> References: <20210302115903.63458-1-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 40946c8587a5..d43b48d8f67d 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -761,7 +761,7 @@ 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