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Tue, 4 Nov 2025 06:26:43 +0000 (GMT) Message-ID: Date: Tue, 4 Nov 2025 11:56:42 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] Export kdump crashkernel CMA ranges To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Baoquan he , Jiri Bohac , Shivang Upadhyay , linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org, Vivek Goyal , Dave Young , Pingfan Liu , "Ritesh Harjani (IBM)" , Madhavan Srinivasan , Aditya Gupta , Mahesh J Salgaonkar , Hari Bathini References: <20251103035859.1267318-1-sourabhjain@linux.ibm.com> Content-Language: en-US From: Sourabh Jain In-Reply-To: <20251103035859.1267318-1-sourabhjain@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: opMdqXoXuHzzqDA97ozX4NfvyOjw1gdU X-Authority-Analysis: v=2.4 cv=MKhtWcZl c=1 sm=1 tr=0 ts=69099cac cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=voM4FWlXAAAA:8 a=JfrnYn6hAAAA:8 a=iJAgtciTF2dadzWhSi8A:9 a=QEXdDO2ut3YA:10 a=HkZW87K1Qel5hWWM3VKY:22 a=IC2XNlieTeVoXbcui8wp:22 a=1CNFftbPRP8L7MoqJWF3:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: pafzTugha00TAbBSMvDd4fbGf2Zn_0WQ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTAxMDAwMSBTYWx0ZWRfX2lxEIQfUWC+o Io1msdIIhj0d8XkDLU4OSf9j5sShsyGbQy8KjVwl+EjyIx+77cwrRZ2scoYzaBv09DunZD4j+ih 28ufcFTwCNuCWp9Ogab3FwHEH/kb47D4jp4Sd8+nOFyPzYKPL6y4sqPF6h7rvX1V+rGNSsSEymH JcrkFqnmw6WrulIepMl+oDgh/h6V8+t8Sc96JUnBCIMq6f0FZY7DM1M+HkWitedzdIJ9pnx0V3W AzG6wxN5aN/sohGGPNxYUnVT+qz2GX/3v8zYzbZvjh8wGYCFn664dax5y1XB2+WwijXhGm3ScVB Up3QIfCzTqzyTXZMaDJquiQwbkh+JE88BJ4k4iVoS9+jL1B8g0sQhhCJnGYF63k97JCS31ljU7X l7PMaTZwmBhCEtRVeDuAu6FvJICHKQ== 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=2025-11-03_06,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1011 lowpriorityscore=0 malwarescore=0 adultscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511010001 Cc others who can provide input. On 03/11/25 09:28, Sourabh Jain wrote: > /sys/kernel/kexec_crash_cma_ranges to export all CMA regions reserved > for the crashkernel to user-space. This enables user-space tools > configuring kdump to determine the amount of memory reserved for the > crashkernel. When CMA is used for crashkernel allocation, tools can use > this information to warn users that attempting to capture user pages > while CMA reservation is active may lead to unreliable or incomplete > dump capture. > > While adding documentation for the new sysfs interface, I realized that > there was no ABI document for the existing kexec and kdump sysfs > interfaces, so I added one. > > The first patch adds the ABI documentation for the existing kexec and > kdump sysfs interfaces, and the second patch adds the > /sys/kernel/kexec_crash_cma_ranges sysfs interface along with its > corresponding ABI documentation. > > *Seeking opinions* > There are already four kexec/kdump sysfs entries under /sys/kernel/, > and this patch series adds one more. Should we consider moving them to > a separate directory, such as /sys/kernel/kexec, to avoid polluting > /sys/kernel/? For backward compatibility, we can create symlinks at > the old locations for sometime and remove them in the future. > > Cc: Andrew Morton > Cc: Baoquan he > Cc: Jiri Bohac > Cc: Shivang Upadhyay > Cc: linuxppc-dev@lists.ozlabs.org > Cc: kexec@lists.infradead.org > > Sourabh Jain (2): > Documentation/ABI: add kexec and kdump sysfs interface > crash: export crashkernel CMA reservation to userspace > > .../ABI/testing/sysfs-kernel-kexec-kdump | 53 +++++++++++++++++++ > kernel/ksysfs.c | 17 ++++++ > 2 files changed, 70 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump >