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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 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 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: riel@surriel.com, kernel-team@fb.com, Ram Pai , linux-kernel@vger.kernel.org, guro@fb.com, linux-mm@kvack.org, Satheesh Rajendran , Konrad Rzeszutek Wilk , iamjoonsoo.kim@lge.com, mhocko@kernel.org, linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org, Thiago Jung Bauermann Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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