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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 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 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Mike Rapoport writes: > > Signed-off-by: Roman Gushchin >=20 > Reviewed-by: Mike Rapoport I've seen a couple of spurious triggers of the WARN_ONCE() removed by thi= s patch. This happens on some ppc64le bare metal (powernv) server machines = with CONFIG_SWIOTLB=3Dy and crashkernel=3D4G, as described in a candidate patc= h I posted to solve this issue in a different way: https://lore.kernel.org/linuxppc-dev/20201218062103.76102-1-bauerman@linu= x.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 fr= om low memory") This is because reverting the commit above also solves the problem on the machines where I've seen this issue. --=20 Thiago Jung Bauermann IBM Linux Technology Center