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Fri, 14 Nov 2025 05:15:18 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C1D320043; Fri, 14 Nov 2025 05:15:17 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 875372004B; Fri, 14 Nov 2025 05:15:13 +0000 (GMT) Received: from li-4f5ba44c-27d4-11b2-a85c-a08f5b49eada.ibm.com.com (unknown [9.124.211.127]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Nov 2025 05:15:13 +0000 (GMT) From: Sourabh Jain To: linux-kernel@vger.kernel.org Cc: Sourabh Jain , Aditya Gupta , Andrew Morton , Baoquan he , Dave Young , Hari Bathini , Jiri Bohac , Madhavan Srinivasan , Mahesh J Salgaonkar , Pingfan Liu , "Ritesh Harjani (IBM)" , Shivang Upadhyay , Sourabh Jain , Vivek Goyal , linuxppc-dev@lists.ozlabs.org, kexec@lists.infradea Subject: [PATCH v4 0/5] kexec: reorganize sysfs interface and add new kexec sysfs Date: Fri, 14 Nov 2025 10:44:59 +0530 Message-ID: <20251114051504.614937-1-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.51.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: dMzjcw9Cj46WjoUoIhjSlvf7aWe7d-J1 X-Authority-Analysis: v=2.4 cv=E9nAZKdl c=1 sm=1 tr=0 ts=6916baee cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=pGLkceISAAAA:8 a=voM4FWlXAAAA:8 a=U2Zq5r_CMUrxw1IodPQA:9 a=HkZW87K1Qel5hWWM3VKY:22 a=IC2XNlieTeVoXbcui8wp:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTEzMDE3OSBTYWx0ZWRfXzfbxI6b6iVE6 N48ODHxus5lobbXO//8GFwosiNNbH2MjK7su6OfXMdVizz1q189ks+sSZ9ezH2eTqKeEqcMCw3y LdX4nkzOXBJLVQgLwAnCVkP94Ix+/ge8kSbazvlJ8pF1hhemKSJwkAdwolwUDk5HhhTt2NGBiJb KToa8cmxrxVB/G318Dm3icXLT34/xD8K28R62U1Ujbg6TL8dATe7yAXyQyVxK6rRpmx0YQqiLSZ xFpOPcqO7+u43Z2AtKmfL8T2/goy1mhi4613BxzRoBRqKEA5maA9qYwVCB1yu7xUE4FMFC34Zld PSSlDAzUGG1BEEZOLFNOGovfh/Z5rNtZpinVtmLD08dgoaNypqPXdLaf4elf+rf6dqkVXjeoYAT J+TbwrsV4Qg2zFjA6b1+2FlJybUjvw== X-Proofpoint-GUID: E6Nn5BYA5mdjv9X6KbOEeFbajhkHr2gL 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=2025-11-13_07,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 impostorscore=0 malwarescore=0 clxscore=1011 priorityscore=1501 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511130179 All existing kexec and kdump sysfs entries are moved to a new location, /sys/kernel/kexec, to keep /sys/kernel/ clean and better organized. Symlinks are created at the old locations for backward compatibility and can be removed in the future [02/05]. While doing this cleanup, missing ABI documentation for the old sysfs interfaces is added, and those entries are marked as deprecated [01/05 and 03/05]. New ABI documentation is also added for the reorganized interfaces. [04/05] Along with this reorganization, a new sysfs file, /sys/kernel/kexec/crash_cma_ranges, is introduced to export crashkernel CMA reservation details to user space [05/05]. This helps tools determine the total crashkernel reserved memory and warn users that capturing user pages while CMA is reserved may cause incomplete or unreliable dumps. Changlog: --------- v2 -> v3: - Add the missing hunk to export crash_cma_ranges sysfs [05/05] - Declare kexec_kobj static [02/05] v3 -> v4: - Update the commit log of [05/05] to explain why Crash CMA Ranges are not exported to /proc/iomem. Cc: Aditya Gupta Cc: Andrew Morton Cc: Baoquan he Cc: Dave Young Cc: Hari Bathini Cc: Jiri Bohac Cc: Madhavan Srinivasan Cc: Mahesh J Salgaonkar Cc: Pingfan Liu Cc: Ritesh Harjani (IBM) Cc: Shivang Upadhyay Cc: Sourabh Jain Cc: Vivek Goyal Cc: linuxppc-dev@lists.ozlabs.org Cc: kexec@lists.infradea Sourabh Jain (5): Documentation/ABI: add kexec and kdump sysfs interface kexec: move sysfs entries to /sys/kernel/kexec Documentation/ABI: mark old kexec sysfs deprecated kexec: document new kexec and kdump sysfs ABIs crash: export crashkernel CMA reservation to userspace .../ABI/obsolete/sysfs-kernel-kexec-kdump | 59 ++++++++ .../ABI/testing/sysfs-kernel-kexec-kdump | 61 ++++++++ kernel/kexec_core.c | 135 ++++++++++++++++++ kernel/ksysfs.c | 68 +-------- 4 files changed, 256 insertions(+), 67 deletions(-) create mode 100644 Documentation/ABI/obsolete/sysfs-kernel-kexec-kdump create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump -- 2.51.1