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[PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation

Jinjie Ruan posted 15 patches 5 hours ago 
.../admin-guide/kernel-parameters.txt         |  16 +--
arch/arm64/kernel/machine_kexec_file.c        |  43 +++-----
arch/arm64/mm/init.c                          |   5 +-
arch/loongarch/kernel/machine_kexec_file.c    |  43 +++-----
arch/powerpc/include/asm/kexec_ranges.h       |   1 -
arch/powerpc/kexec/crash.c                    |   7 +-
arch/powerpc/kexec/ranges.c                   | 101 +-----------------
arch/riscv/kernel/machine_kexec_file.c        |  42 +++-----
arch/riscv/mm/init.c                          |   5 +-
arch/x86/kernel/crash.c                       |  92 +++-------------
drivers/of/fdt.c                              |   9 +-
drivers/of/kexec.c                            |   9 ++
include/linux/crash_core.h                    |   9 ++
include/linux/crash_reserve.h                 |   4 +-
kernel/crash_core.c                           |  89 ++++++++++++++-
15 files changed, 193 insertions(+), 282 deletions(-)
[PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation
Posted by Jinjie Ruan 5 hours ago 
The crash memory allocation, and the exclude of crashk_res, crashk_low_res
and crashk_cma memory are almost identical across different architectures,
This patch set handle them in crash core in a general way, which eliminate
a lot of duplication code.

And add support for crashkernel CMA reservation for arm64 and riscv.

Rebased on v7.0-rc1.

Basic second kernel boot test were performed on QEMU platforms for x86,
ARM64, and RISC-V architectures with the following parameters:

	"cma=256M crashkernel=256M crashkernel=64M,cma"

Changes in v12:
- Remove the unused "nr_mem_ranges" for x86.
- Add "Fix crashk_low_res not exclude bug" test log.
- Provide a separate patch for each architecture for using
  crash_prepare_headers(), which will make the review more convenient.
- Add Reviewed-by and Tested-by.
- Link to v11: https://lore.kernel.org/all/20260328074013.3589544-1-ruanjinjie@huawei.com/

Changes in v11:
- Avoid silently drop crash memory if the crash kernel is built without
  CONFIG_CMA.
- Remove unnecessary "cmem->nr_ranges = 0" for arch_crash_populate_cmem()
  as we use kvzalloc().
- Provide a separate patch for each architecture to fix the existing
  buffer overflow issue.
- Add Acked-bys for arm64.

Changes in v10:
- Fix crashk_low_res not excluded bug in the existing
  RISC-V code.
- Fix an existing memory leak issue in the existing PowerPC code.
- Fix the ordering issue of adding CMA ranges to
  "linux,usable-memory-range".
- Fix an existing concurrency issue. A Concurrent memory hotplug may occur
  between reading memblock and attempting to fill cmem during kexec_load()
  for almost all existing architectures.
- Link to v9: https://lore.kernel.org/all/20260323072745.2481719-1-ruanjinjie@huawei.com/

Changes in v9:
- Collect Reviewed-by and Acked-by, and prepare for Sashiko AI review.
- Link to v8: https://lore.kernel.org/all/20260302035315.3892241-1-ruanjinjie@huawei.com/

Changes in v8:
- Fix the build issues reported by kernel test robot and Sourabh.
- Link to v7: https://lore.kernel.org/all/20260226130437.1867658-1-ruanjinjie@huawei.com/

Changes in v7:
- Correct the inclusion of CMA-reserved ranges for kdump kernel in of/kexec
  for arm64 and riscv.
- Add Acked-by.
- Link to v6: https://lore.kernel.org/all/20260224085342.387996-1-ruanjinjie@huawei.com/

Changes in v6:
- Update the crash core exclude code as Mike suggested.
- Rebased on v7.0-rc1.
- Add acked-by.
- Link to v5: https://lore.kernel.org/all/20260212101001.343158-1-ruanjinjie@huawei.com/

Jinjie Ruan (14):
  riscv: kexec_file: Fix crashk_low_res not exclude bug
  powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()
  x86/kexec: Fix potential buffer overflow in prepare_elf_headers()
  arm64: kexec_file: Fix potential buffer overflow in
    prepare_elf_headers()
  riscv: kexec_file: Fix potential buffer overflow in
    prepare_elf_headers()
  LoongArch: kexec: Fix potential buffer overflow in
    prepare_elf_headers()
  crash: Add crash_prepare_headers() to exclude crash kernel memory
  arm64: kexec_file: Use crash_prepare_headers() helper to simplify code
  x86/kexec: Use crash_prepare_headers() helper to simplify code
  riscv: kexec_file: Use crash_prepare_headers() helper to simplify code
  LoongArch: kexec: Use crash_prepare_headers() helper to simplify code
  crash: Use crash_exclude_core_ranges() on powerpc
  arm64: kexec: Add support for crashkernel CMA reservation
  riscv: kexec: Add support for crashkernel CMA reservation

Sourabh Jain (1):
  powerpc/crash: sort crash memory ranges before preparing elfcorehdr

 .../admin-guide/kernel-parameters.txt         |  16 +--
 arch/arm64/kernel/machine_kexec_file.c        |  43 +++-----
 arch/arm64/mm/init.c                          |   5 +-
 arch/loongarch/kernel/machine_kexec_file.c    |  43 +++-----
 arch/powerpc/include/asm/kexec_ranges.h       |   1 -
 arch/powerpc/kexec/crash.c                    |   7 +-
 arch/powerpc/kexec/ranges.c                   | 101 +-----------------
 arch/riscv/kernel/machine_kexec_file.c        |  42 +++-----
 arch/riscv/mm/init.c                          |   5 +-
 arch/x86/kernel/crash.c                       |  92 +++-------------
 drivers/of/fdt.c                              |   9 +-
 drivers/of/kexec.c                            |   9 ++
 include/linux/crash_core.h                    |   9 ++
 include/linux/crash_reserve.h                 |   4 +-
 kernel/crash_core.c                           |  89 ++++++++++++++-
 15 files changed, 193 insertions(+), 282 deletions(-)

-- 
2.34.1
Re: [PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation
Posted by Borislav Petkov an hour ago 
On Thu, Apr 02, 2026 at 03:26:46PM +0800, Jinjie Ruan wrote:
> The crash memory allocation, and the exclude of crashk_res, crashk_low_res
> and crashk_cma memory are almost identical across different architectures,
> This patch set handle them in crash core in a general way, which eliminate
> a lot of duplication code.

From: Documentation/process/submitting-patches.rst

"Don't get discouraged - or impatient
------------------------------------

After you have submitted your change, be patient and wait.  Reviewers are
busy people and may not get to your patch right away.

Once upon a time, patches used to disappear into the void without comment,
but the development process works more smoothly than that now.  You should
receive comments within a week or so; if that does not happen, make sure
that you have sent your patches to the right place.  Wait for a minimum of
						     ^^^^^^^^^^^^^^^^^^^^^

one week before resubmitting or pinging reviewers - possibly longer during
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

busy times like merge windows."

You need to be patient and send once a week and not spam people:

Feb 04 Jinjie Ruan ( :1.0K|) [PATCH v3 0/3] arm64/riscv: Add support for crashkernel CMA reservation
Feb 09 Jinjie Ruan ( :1.5K|) [PATCH v4 0/3] arm64/riscv: Add support for crashkernel CMA reservation
Feb 12 Jinjie Ruan ( :2.1K|) [PATCH v5 0/4] arm64/riscv: Add support for crashkernel CMA reservation
Feb 24 Jinjie Ruan ( :2.3K|) [PATCH v6 0/5] arm64/riscv: Add support for crashkernel CMA reservation
Feb 26 Jinjie Ruan ( :2.5K|) [PATCH v7 0/5] arm64/riscv: Add support for crashkernel CMA reservation
Mar 02 Jinjie Ruan ( :2.8K|) [PATCH v8 0/5] arm64/riscv: Add support for crashkernel CMA reservation
Mar 23 Jinjie Ruan ( :2.9K|) [PATCH v9 0/5] arm64/riscv: Add support for crashkernel CMA reservation
Mar 25 Jinjie Ruan ( :3.7K|) [PATCH v10 0/8] arm64/riscv: Add support for crashkernel CMA reservation
Mar 28 Jinjie Ruan ( :4.3K|) [PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA reservation
Apr 02 Jinjie Ruan ( :4.5K|) [PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
Re: [PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation
Posted by Jinjie Ruan 46 minutes ago 

On 2026/4/2 19:31, Borislav Petkov wrote:
> On Thu, Apr 02, 2026 at 03:26:46PM +0800, Jinjie Ruan wrote:
>> The crash memory allocation, and the exclude of crashk_res, crashk_low_res
>> and crashk_cma memory are almost identical across different architectures,
>> This patch set handle them in crash core in a general way, which eliminate
>> a lot of duplication code.
> 
> From: Documentation/process/submitting-patches.rst
> 
> "Don't get discouraged - or impatient
> ------------------------------------
> 
> After you have submitted your change, be patient and wait.  Reviewers are
> busy people and may not get to your patch right away.
> 
> Once upon a time, patches used to disappear into the void without comment,
> but the development process works more smoothly than that now.  You should
> receive comments within a week or so; if that does not happen, make sure
> that you have sent your patches to the right place.  Wait for a minimum of
> 						     ^^^^^^^^^^^^^^^^^^^^^
> 
> one week before resubmitting or pinging reviewers - possibly longer during
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> busy times like merge windows."
> 
> You need to be patient and send once a week and not spam people:

Thank you for the reminder and for your patience. I apologize for the
frequent updates; I am becoming more familiar with the community's
workflow. I will follow your advice, limit my follow-ups to once a week,
and avoid resending during busy periods like the merge window. I'll wait
for further feedback before taking the next step.

> 
> Feb 04 Jinjie Ruan ( :1.0K|) [PATCH v3 0/3] arm64/riscv: Add support for crashkernel CMA reservation
> Feb 09 Jinjie Ruan ( :1.5K|) [PATCH v4 0/3] arm64/riscv: Add support for crashkernel CMA reservation
> Feb 12 Jinjie Ruan ( :2.1K|) [PATCH v5 0/4] arm64/riscv: Add support for crashkernel CMA reservation
> Feb 24 Jinjie Ruan ( :2.3K|) [PATCH v6 0/5] arm64/riscv: Add support for crashkernel CMA reservation
> Feb 26 Jinjie Ruan ( :2.5K|) [PATCH v7 0/5] arm64/riscv: Add support for crashkernel CMA reservation
> Mar 02 Jinjie Ruan ( :2.8K|) [PATCH v8 0/5] arm64/riscv: Add support for crashkernel CMA reservation
> Mar 23 Jinjie Ruan ( :2.9K|) [PATCH v9 0/5] arm64/riscv: Add support for crashkernel CMA reservation
> Mar 25 Jinjie Ruan ( :3.7K|) [PATCH v10 0/8] arm64/riscv: Add support for crashkernel CMA reservation
> Mar 28 Jinjie Ruan ( :4.3K|) [PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA reservation
> Apr 02 Jinjie Ruan ( :4.5K|) [PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation
>

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