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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 85608C433DF for ; Tue, 7 Jul 2020 15:24:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64CAB20663 for ; Tue, 7 Jul 2020 15:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594135497; bh=c+QW1mE2tGRPZcQtySA3Jab8B8UJPsk/3gFArtC+8zc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Vx7Va7+Nloug29HkWl+4szuNdrCEhvdhxRTnaN6XdJ6WluLyt1KSyhFEvT+89HPng HS7LMggOuzaarRKGhJ0UKKmMeaDKZKLy8Ei8VPO0ZUiISHzB3XnuPNhFgig66cKOmm yBKOHHnVPDQQEyKLOIN4+1Jd5rN29o0BiscnR698= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730157AbgGGPYz (ORCPT ); Tue, 7 Jul 2020 11:24:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:38528 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730140AbgGGPYu (ORCPT ); Tue, 7 Jul 2020 11:24:50 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 67B0520663; Tue, 7 Jul 2020 15:24:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594135489; bh=c+QW1mE2tGRPZcQtySA3Jab8B8UJPsk/3gFArtC+8zc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YsZuysiHa0JV4RGL2t4M9iPHO/DZsHOGPqdzCeUr8IpTq/v/HI+kw5zC4bu8gfxJ+ htYGHFWSwPcJWnx5Xlq7MKUJ/TOuSVdV2f1ARUTutsjwO39ytA2TzfCuN+9OgeBN3U u7qpa91fSbXn/zVjDXOPUsyYuMZAuAOMpgKaLMZ0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christian Borntraeger , Heiko Carstens , Sasha Levin Subject: [PATCH 5.7 032/112] s390/debug: avoid kernel warning on too large number of pages Date: Tue, 7 Jul 2020 17:16:37 +0200 Message-Id: <20200707145802.515465308@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200707145800.925304888@linuxfoundation.org> References: <20200707145800.925304888@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christian Borntraeger [ Upstream commit 827c4913923e0b441ba07ba4cc41e01181102303 ] When specifying insanely large debug buffers a kernel warning is printed. The debug code does handle the error gracefully, though. Instead of duplicating the check let us silence the warning to avoid crashes when panic_on_warn is used. Signed-off-by: Christian Borntraeger Reviewed-by: Heiko Carstens Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/kernel/debug.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 6d321f5f101d6..7184d55d87aae 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -198,9 +198,10 @@ static debug_entry_t ***debug_areas_alloc(int pages_per_area, int nr_areas) if (!areas) goto fail_malloc_areas; for (i = 0; i < nr_areas; i++) { + /* GFP_NOWARN to avoid user triggerable WARN, we handle fails */ areas[i] = kmalloc_array(pages_per_area, sizeof(debug_entry_t *), - GFP_KERNEL); + GFP_KERNEL | __GFP_NOWARN); if (!areas[i]) goto fail_malloc_areas2; for (j = 0; j < pages_per_area; j++) { -- 2.25.1