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[23.128.96.18]) by mx.google.com with ESMTP id j4si3116373edn.609.2021.01.21.21.15.14; Thu, 21 Jan 2021 21:15:37 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b="N/68MV7o"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726204AbhAVEiz (ORCPT + 99 others); Thu, 21 Jan 2021 23:38:55 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:16984 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726000AbhAVEiy (ORCPT ); Thu, 21 Jan 2021 23:38:54 -0500 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 10M4V5wp152474; Thu, 21 Jan 2021 23:37:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=vkX/AsSloHT96juAe9Yya0blAn3yMSuqmehDZQklXrg=; b=N/68MV7oWLGpiFjW4KTzhq7E0CtW+jHErzGi/w7opYvuwQC28pZDVNGaCPAFI6uMlQP2 +o6rPlFwK0J2W/Y4ofh/tB/4t6m8IG1CZi8x2Ex/w1zq0LODDirewdZGjHy+DYK4bu/i Bs8t73LhRbC50AvDTG2W2xC8AKzOGwgnvi10XLjpt001PGE0FzifdrgCLxYDDQ2sSNXX toiL2OnYAsdTQKre67aNmtdTewRckwqS6dliylasUL3inNezqmXJ2T7V1CKiK3jliNNs pwms8X6B2ljH6IGadewMU/No6v5dDdjiBPV2fdAQklcF0lZC5c8E2e+2dEjc2W5WmOOw Kw== Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0b-001b2d01.pphosted.com with ESMTP id 367pcm9svb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 21 Jan 2021 23:37:40 -0500 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 10M4Wvn7003581; Fri, 22 Jan 2021 04:37:40 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma04dal.us.ibm.com with ESMTP id 367k0shx5h-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 22 Jan 2021 04:37:40 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 10M4bdVL37159296 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 22 Jan 2021 04:37:39 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 69444AC05B; Fri, 22 Jan 2021 04:37:39 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 13BBBAC059; Fri, 22 Jan 2021 04:37:36 +0000 (GMT) Received: from manicouagan.localdomain.com (unknown [9.85.140.199]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 22 Jan 2021 04:37:35 +0000 (GMT) From: Thiago Jung Bauermann To: rppt@kernel.org Cc: akpm@linux-foundation.org, guro@fb.com, iamjoonsoo.kim@lge.com, Ram Pai , Konrad Rzeszutek Wilk , Satheesh Rajendran , kernel-team@fb.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, mhocko@kernel.org, riel@surriel.com, Thiago Jung Bauermann Subject: Re: [PATCH v2 2/2] memblock: do not start bottom-up allocations with kernel_end Date: Fri, 22 Jan 2021 01:37:14 -0300 Message-Id: <20210122043714.266075-1-bauerman@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201220064959.GB392325@kernel.org> References: <20201220064959.GB392325@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2021-01-22_02:2021-01-21,2021-01-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 mlxscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 mlxlogscore=952 spamscore=0 clxscore=1011 impostorscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101220018 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mike Rapoport writes: > > Signed-off-by: Roman Gushchin > > Reviewed-by: Mike Rapoport I've seen a couple of spurious triggers of the WARN_ONCE() removed by this patch. This happens on some ppc64le bare metal (powernv) server machines with CONFIG_SWIOTLB=y and crashkernel=4G, as described in a candidate patch I posted to solve this issue in a different way: https://lore.kernel.org/linuxppc-dev/20201218062103.76102-1-bauerman@linux.ibm.com/ Since this patch solves that problem, is it possible to include it in the next feasible v5.11-rcX, with the following tag? Fixes: 8fabc623238e ("powerpc: Ensure that swiotlb buffer is allocated from low memory") This is because reverting the commit above also solves the problem on the machines where I've seen this issue. -- Thiago Jung Bauermann IBM Linux Technology Center