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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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.