linux-kernel - Re: [PATCH v4 0/5] kexec: reorganize sysfs interface and add new kexec sysfs

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Message-Id: <20251114152550.ac2dd5e23542f09c62defec7@linux-foundation.org>
Date: Fri, 14 Nov 2025 15:25:50 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Sourabh Jain <sourabhjain@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, Aditya Gupta <adityag@...ux.ibm.com>,
 Baoquan he <bhe@...hat.com>, Dave Young <dyoung@...hat.com>, Hari Bathini
 <hbathini@...ux.ibm.com>, Jiri Bohac <jbohac@...e.cz>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Mahesh J Salgaonkar <mahesh@...ux.ibm.com>, Pingfan
 Liu <piliu@...hat.com>, "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
 Shivang Upadhyay <shivangu@...ux.ibm.com>, Sourabh Jain
 <sourabhjains@...ux.ibm.com>, Vivek Goyal <vgoyal@...hat.com>,
 linuxppc-dev@...ts.ozlabs.org, kexec@...ts.infradea
Subject: Re: [PATCH v4 0/5]  kexec: reorganize sysfs interface and add new
 kexec sysfs

On Fri, 14 Nov 2025 10:44:59 +0530 Sourabh Jain <sourabhjain@...ux.ibm.com> wrote:

> 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.

Patchset does three unrelated things in remarkably random order.

1: Document existing stuff

	Great, thanks, in it goes.

2: export crashkernel CMA reservation to userspace

	Well, OK, probably reasonable, didn't look closely.

3: Alter longstanding userspace ABI with deprecation plan

	Whoa, tricky, needs careful consideration.


So can we please prepare and consider this material in three separate
patchsets?  In the above order, I suggest.