us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url:
https://github.com/intel-lab-lkp/linux/commits/Sourabh-Jain/crash-forward-memory_notify-arg-to-arch-crash-hotplug-handler/20231029-213858
On Fri, Oct 20 2023 at 18:12, Kirill A. Shutemov wrote:
> MADT Multiprocessor Wakeup structure version 1 brings support of CPU
> offlining: BIOS provides a reset vector where the CPU has to jump to
> offline itself. The new TEST mailbox command can be used to test the CPU
> offlined successfully
On Sat, Oct 28, 2023 at 04:12:10PM +0200, Thomas Gleixner wrote:
> On Fri, Oct 20 2023 at 18:12, Kirill A. Shutemov wrote:
>
> Subject: cpu/hotplug: ...
>
> > ACPI MADT doesn't allow to offline CPU after it got woke up.
>
> ACPI MADT is a table ...
>
> This is about the MADT mailbox wakeup
Due to CPU/Memory hotplug or online/offline events the elfcorehdr
(which describes the CPUs and memory of the crashed kernel) and FDT
(Flattened Device Tree) of kdump image becomes outdated. Consequently,
attempting dump collection with an outdated elfcorehdr or FDT can lead
to failed or
The commit a72bbec70da2 ("crash: hotplug support for kexec_load()")
introduced a new kexec flag, `KEXEC_UPDATE_ELFCOREHDR`. Kexec tool uses
this flag to indicate kernel that it is safe to modify the elfcorehdr
of kdump image loaded using kexec_load system call.
Similarly, add a new kexec flag,
Move the functions update_cpus_node and get_crash_memory_ranges from
kexec/file_load_64.c to kexec/core_64.c to make these functions usable
by other kexec components.
Later in the series, these functions are utilized for in-kernel updates
to kdump image during CPU/Memory hotplug or online/offline
Architectures' specific functions `arch_crash_hotplug_cpu_support()` and
`arch_crash_hotplug_memory_support()` advertise the kernel's capability
to update the kdump image on CPU and Memory hotplug events to userspace
via the sysfs interface. These architecture-specific functions need to
access
Commit 247262756121 ("crash: add generic infrastructure for crash
hotplug support") added a generic infrastructure that allows
architectures to selectively update the kdump image component during CPU
or memory add/remove events within the kernel itself.
This patch series adds crash hotplug
In the event of memory hotplug or online/offline events, the crash
memory hotplug notifier `crash_memhp_notifier()` receives a
`memory_notify` object but doesn't forward that object to the
generic and architecture-specific crash hotplug handler.
The `memory_notify` object contains the starting
Extend the arch crash hotplug handler, as introduced by the patch title
("powerpc: add crash CPU hotplug support"), to also support memory
add/remove events.
Elfcorehdr describes the memory of the crash kernel to capture the
kernel; hence, it needs to be updated if memory resources change due to
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