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Sun, 12 Oct 2025 16:53:11 +0000 (GMT) Date: Sun, 12 Oct 2025 18:53:10 +0200 From: Heiko Carstens To: Andrew Morton Cc: Sumanth Korikkar , David Hildenbrand , linux-mm , LKML , linux-s390 , Gerald Schaefer , Vasily Gorbik , Alexander Gordeev Subject: Re: [PATCH v3 0/4] Support dynamic (de)configuration of memory Message-ID: <20251012165310.56572A3d-hca@linux.ibm.com> References: <20251010085147.2175918-1-sumanthk@linux.ibm.com> <20251011114426.5313b7cb6951618c20ab62ca@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251011114426.5313b7cb6951618c20ab62ca@linux-foundation.org> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 01PQDja_xbgElKHR2TdnRKhXwIJDSUh8 X-Authority-Analysis: v=2.4 cv=Kr1AGGWN c=1 sm=1 tr=0 ts=68ebdcfd cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=VnNF1IyMAAAA:8 a=amVAB9R6KjWVUBAK2OEA:9 a=CjuIK1q_8ugA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: 01PQDja_xbgElKHR2TdnRKhXwIJDSUh8 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDExMDAxNCBTYWx0ZWRfX7ZI9a5FEts5A /3agJNK2lThnDOJjuxKDdY0M3Nw9T+g5llBvVulTJD0GcVMHJju+mWB8tDZeTXpdtgeDFesVfSm geySesNVRllwQdGCOeqfTlf4B49oLSNCwOG/cZtor6v4qfG+332qOdXRt5vY68xitl3P4J6GTJ8 SB7QuV4dLJey6QPuTN5H8YzGZX5/0iSrkAgPosxwV9SjKdTigRZo2ZYVQhRjCx1jlbtcpPyndST NJFdjp6C7kQnCrj92j1xCDZrtTAssr+3i89A5mtoU9rEPVU2Lslb2knWUbJQKdWHIrjhV4UaKGd /P80iFEGTFdNFdaqFNmtyo0jwKlr+CqsYTKKrwZ3NJohJTRaUKfGTFPu+NvggQgwRbWRwQWfW5i ZC7M+S657oSeVpkQv08bZEglkEJZSg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-12_06,2025-10-06_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510110014 X-Stat-Signature: zos7zc9r3azdf5yewaees63mxz8e9eyj X-Rspamd-Queue-Id: 0785314000E X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1760287998-368548 X-HE-Meta: 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 GkAh0NQj 87PJagqruxEKgbwasK+8ZFAO42SatJuG7yZSHCiBZotBXzqjlh3p0GwBFwgjBIRWkumEm6TClt69luMEg42N4TCTNi/k3Yj5TA0CnOn2e4f7FsWnRRs/LyqLpzH0PYXOGmtWD0ZBkayAoJXfY6QfOjNcmwK/R3t3F/ijMKcyqeoYJL7kh7424Cb1YJgvYeQFBeK5c1LiOk0rdrqowyJZDCUj4y3pqvn7DZMD676NqwRGaF+Q= 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: List-Subscribe: List-Unsubscribe: On Sat, Oct 11, 2025 at 11:44:26AM -0700, Andrew Morton wrote: > On Fri, 10 Oct 2025 10:51:43 +0200 Sumanth Korikkar wrote: > > Patchset provides a new interface for dynamic configuration and > > deconfiguration of hotplug memory on s390, allowing with/without > > memmap_on_memory support. It is a follow up on the discussion with David > > when introducing memmap_on_memory support for s390 and support dynamic > > (de)configuration of memory: > > > > ... > > > > arch/s390/mm/pgalloc.c | 2 + > > arch/s390/mm/vmem.c | 21 +-- > > drivers/base/memory.c | 23 +-- > > drivers/s390/char/sclp_mem.c | 288 +++++++++++++++++++++++---------- > > include/linux/memory.h | 9 -- > > include/linux/memory_hotplug.h | 18 +-- > > include/linux/memremap.h | 1 - > > mm/memory_hotplug.c | 17 +- > > mm/sparse.c | 3 +- > > 9 files changed, 225 insertions(+), 157 deletions(-) > > I can add this to mm.git in the usual fashion, but the s390 tree would > be a better place from a testing point of view? It is not only about the testing point of view. We also want the correspondig util-linux changes upstream - there may (or much more likely may not) feedback which could require additional changes. Which means we would going back and forth. I think it is easiest to move forward with the s390 tree because of this.