On Tue, 23 Apr 2024 01:29:29 +0530, Sourabh Jain wrote:

Problem:
========
Due to changes in memory resources caused by either memory hotplug or
online/offline events, the elfcorehdr, which describes the cpus and
memory of the crashed kernel to the kernel that collects the dump (known
as second/fadump kernel), becomes outdated. Consequently, attempting
dump collection with an outdated elfcorehdr can lead to failed or
inaccurate dump collection.

[...]

Applied to powerpc/next.

[1/3] powerpc: make fadump resilient with memory add/remove events
      https://git.kernel.org/powerpc/c/c6c5b14dac0d1bd0da8b4d1d3b77f18eb9085fcb
[2/3] powerpc/fadump: add hotplug_ready sysfs interface
      https://git.kernel.org/powerpc/c/bc446c5acabadeb38b61b565535401c5dfdd1214
[3/3] Documentation/powerpc: update fadump implementation details
      https://git.kernel.org/powerpc/c/57e6700145c5d1f49c52137e9163f73ec5441256

cheers