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=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 ADCBCC433DF for ; Tue, 7 Jul 2020 15:19:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8429520738 for ; Tue, 7 Jul 2020 15:19:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594135147; bh=LH6KfOFAuiAo8bo2kq2zE0/ec7aS2WUgR/NPwDfufoY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BjbXZQB1HhwH97mkPDaedwOQrEpSH5vD6WdWks9AoK+/86yxEtp0xRwGo9W3SEpNo 9qvl6Al9Viprjmw80QCNuCxjMDo81HFnr7cDdwUXfMffslJ8BZr1a48MqulApriD6K yqU3WYUE4IisCZxXNM6pu4qReHg9QT77n4ifJwcc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728578AbgGGPTG (ORCPT ); Tue, 7 Jul 2020 11:19:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:58650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728489AbgGGPTC (ORCPT ); Tue, 7 Jul 2020 11:19:02 -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 15A842065D; Tue, 7 Jul 2020 15:19:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594135142; bh=LH6KfOFAuiAo8bo2kq2zE0/ec7aS2WUgR/NPwDfufoY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AycJ86F8nDGlrbjYwwfqqkyF0ftdFndQMUjC7p6Y/bBP7HQrFXozqoWMxVGSS0njj wpiB0Fx8ORgcG/feEyYMxJoUWSyjZD3Kdf6zG00AoV1K7JeXVkx/0UUqQ/IFfiilGm K22BbnJH1ibfDWXE0rDW9/SrOK6VhAo38+rzoaxI= 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 4.19 08/36] s390/debug: avoid kernel warning on too large number of pages Date: Tue, 7 Jul 2020 17:17:00 +0200 Message-Id: <20200707145749.535952718@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200707145749.130272978@linuxfoundation.org> References: <20200707145749.130272978@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 d374f9b218b4c..04bbf7e97fea7 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