Hi Jinjie,
On Thu, Jul 23, 2026 at 09:12:34PM +0800, Jinjie Ruan wrote:
> When CPU or memory hotplug events occur, the elfcorehdr in the kdump image
> becomes stale, potentially leading to incomplete crash dumps.
>
> Currently, userspace udev rules reload the entire kdump image upon such
> events, which is inefficient and leaves kdump inactive for a long time.
>
> Commit 247262756121 ("crash: add generic infrastructure for crash hotplug
> support") introduced a kernel mechanism to update only the elfcorehdr.
> This patch set implements crash hotplug support for arm64.
>
> It also addresses and fixes several critical pre-existing code issues
> and Sashiko AI review findings extracted from the previous patch set,
> following Baoquan's suggestions.
>
> The major improvements and fixes included in this series are:
>
> - Fix powerpc memory leak, null-ptr-def and overlapping memory
> range truncation bug.
>
> - Fix several memory leaks for arm64.
>
> - Simplify arm64 load_other_segments().
>
> - Implement infrastructure for arm64 crash memory hotplug support.
>
> This patch set is rebased on liveupdate/crashkernel-cma.
>
> Link:
> https://lore.kernel.org/all/[email protected]/
>
> Jinjie Ruan (8):
> powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()
> powerpc/kexec_file: Fix null-ptr-def in extra size calculation
> powerpc/kexec_file: Prevent kexec range truncation
It's weird to see powerpc fixes in a series that adds a feature for arm64.
Judging by the subjects, they are completely unrelated to to crash support
for hotplug and should be sent as a separate set.
> kexec: Extract kexec_free_segment_cma() from kimage_free_cma()
> arm64: kexec_file: Fix CMA page leaks in segment placement retry loops
> arm64: kexec_file: Fix image->elf_headers memory leak during retry
> loop
> arm64: kexec_file: Simplify load_other_segments()
> arm64: crash: Add crash hotplug support
>
> arch/arm64/Kconfig | 3 +
> arch/arm64/include/asm/kexec.h | 13 +++
> arch/arm64/kernel/Makefile | 2 +-
> arch/arm64/kernel/crash.c | 148 +++++++++++++++++++++++++
> arch/arm64/kernel/kexec_image.c | 1 +
> arch/arm64/kernel/machine_kexec_file.c | 76 ++++++-------
> arch/powerpc/kexec/crash.c | 2 +-
> arch/powerpc/kexec/file_load_64.c | 2 +-
> arch/powerpc/kexec/ranges.c | 12 +-
> include/linux/kexec.h | 2 +
> kernel/kexec_core.c | 25 +++--
> 11 files changed, 223 insertions(+), 63 deletions(-)
> create mode 100644 arch/arm64/kernel/crash.c
>
> --
> 2.34.1
>
--
Sincerely yours,
Mike.
