在 2026/7/26 15:10, Mike Rapoport 写道:
> 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.
Hi Mike,
You are right, I'll rebase and post v2 shortly, and send the powerpc
fixes as a standalone series.
>
>> 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
>>
>
