Re: [PATCH v8 0/5] arm64/riscv: Add support for crashkernel CMA reservation

Jinjie Ruan
2026-03-23T01:44:53Z

If there are no other review comments, I'd like to ask if this is ready
to be merged.

On 2026/3/2 11:53, 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.
>
> 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 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/
>
> Changes in v5:
> - Fix the kernel test robot build warnings.
> - Sort crash memory ranges before preparing elfcorehdr for powerpc
> - Link to v4: https://lore.kernel.org/all/20260209095931.2813152-1-ruanjinjie@huawei.com/
>
> Changes in v4:
> - Move the size calculation (and the realloc if needed) into the
> generic crash.
> - Link to v3: https://lore.kernel.org/all/20260204093728.1447527-1-ruanjinjie@huawei.com/
>
> Jinjie Ruan (4):
> crash: Exclude crash kernel memory in crash core
> 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 | 39 +++----
> arch/arm64/mm/init.c | 5 +-
> arch/loongarch/kernel/machine_kexec_file.c | 39 +++----
> arch/powerpc/include/asm/kexec_ranges.h | 1 -
> arch/powerpc/kexec/crash.c | 5 +-
> arch/powerpc/kexec/ranges.c | 101 +-----------------
> arch/riscv/kernel/machine_kexec_file.c | 38 +++----
> arch/riscv/mm/init.c | 5 +-
> arch/x86/kernel/crash.c | 89 +++------------
> drivers/of/fdt.c | 9 +-
> drivers/of/kexec.c | 9 ++
> include/linux/crash_core.h | 9 ++
> kernel/crash_core.c | 89 ++++++++++++++-
> 14 files changed, 178 insertions(+), 276 deletions(-)