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Thu, 30 Oct 2025 14:56:23 +0000 (GMT) Date: Thu, 30 Oct 2025 15:56:21 +0100 From: Heiko Carstens To: Luiz Capitulino Cc: Gerald Schaefer , David Hildenbrand , borntraeger@linux.ibm.com, joao.m.martins@oracle.com, mike.kravetz@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, gor@linux.ibm.com, agordeev@linux.ibm.com, osalvador@suse.de, akpm@linux-foundation.org, aneesh.kumar@kernel.org Subject: Re: [PATCH v2] s390: fix HugeTLB vmemmap optimization crash Message-ID: <20251030145621.16837Bd6-hca@linux.ibm.com> References: <20251028211533.47694-1-luizcap@redhat.com> <6bbdf4ce-10e3-429b-89fc-ef000f118fec@redhat.com> <20251029104457.8393B96-hca@linux.ibm.com> <9a8254b9-92f8-4530-88e8-fca3b7465908@redhat.com> <20251029124953.8393Cc7-hca@linux.ibm.com> <20251030153807.0a835fee@thinkpad-T15> 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: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: eJT-qssreGV4OP2Nrdb-clNTopJMWB1z X-Authority-Analysis: v=2.4 cv=WPhyn3sR c=1 sm=1 tr=0 ts=69037c9d cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=byvkRpKd6ojhK890NEcA:9 a=CjuIK1q_8ugA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI4MDE2NiBTYWx0ZWRfX/aNxGWQWVx5c Q/e8N/+TAYD1DoLooorVyX7Wqk3cr7aZOB1WNj3KaFmJ4reeZ8/JxL2z8SrQL79CvVKfvw7iTJr Bw24SnuOirymBobzMMTGFsH2AGlyys7DXe3fQByUuW65oYsEQSdPnrE1V4IkhXYTioqlKhof1IJ RnDjpN4xdyekSrpkH36gh+y2e6HB3a2WuG8pDAwCjXQKYMY9WlslqDIUuOANyV+9S0xByRhDk8v lzXbhpwYs2TyEzJ1KzTKBgx+PYoRamifbCRbCaX4zDsa6Ds7yMWdW+memuEIwHlHFWp8chqkWa4 Ya4515iA81bSMMT/5GAXZyDwAdKb6XtPNlSrVcL1rt/EROMDO2NDi7p4OwpFWxvZt0hvRligFnQ 6a/YYPeXtyzTrbHv5+Uz59GCDEHiEg== X-Proofpoint-ORIG-GUID: eJT-qssreGV4OP2Nrdb-clNTopJMWB1z X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-10-30_04,2025-10-29_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 malwarescore=0 suspectscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2510280166 On Thu, Oct 30, 2025 at 10:54:47AM -0400, Luiz Capitulino wrote: > On 2025-10-30 10:38, Gerald Schaefer wrote: > > On Wed, 29 Oct 2025 13:49:53 +0100 > > Heiko Carstens wrote: > > Therefore, we should disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, for > > now. Doing it right would most likely require common code changes and > > CRDTE / CSPG usage on s390. Not sure if this feature is really worth the > > hassle, reading all the drawbacks that I mentioned in my commit 00a34d5a99c0 > > ("s390: select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP"). > > OK, let's do the right thing. Do you plan to post a patch? I can do it > if you would like. It is already in your inbox :)