[PW_SID:1072012] arm64/riscv: Add support for crashkernel CMA reservation by linux-riscv-bot · Pull Request #1666 · linux-riscv/linux

linux-riscv-bot · 2026-03-25T04:05:53Z

PR for series 1072012 applied to workflow__riscv__for-next

Name: arm64/riscv: Add support for crashkernel CMA reservation
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1072012
Version: 10

As done in commit 944a45a ("arm64: kdump: Reimplement crashkernel=X") and commit 4831be7 ("arm64/kexec: Fix missing extra range for crashkres_low.") for arm64, while implementing crashkernel=X,[high,low], riscv should have excluded the "crashk_low_res" reserved ranges from the crash kernel memory to prevent them from being exported through /proc/vmcore, and the exclusion would need an extra crash_mem range. Fixes: 5882e5a ("riscv: kdump: Implement crashkernel=X,[high,low]") Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

In get_crash_memory_ranges(), if crash_exclude_mem_range() failed after realloc_mem_ranges() has successfully allocated the cmem memory, it just returns an error but leaves cmem pointing to the allocated memory, nor is it freed in the caller update_crash_elfcorehdr(), which cause a memory leak, goto out to free the cmem. Fixes: 849599b ("powerpc/crash: add crash memory hotplug support") Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

During a memory hot-remove event, the elfcorehdr is rebuilt to exclude the removed memory. While updating the crash memory ranges for this operation, the crash memory ranges array can become unsorted. This happens because remove_mem_range() may split a memory range into two parts and append the higher-address part as a separate range at the end of the array. So far, no issues have been observed due to the unsorted crash memory ranges. However, this could lead to problems once crash memory range removal is handled by generic code, as introduced in the upcoming patches in this series. Currently, powerpc uses a platform-specific function, remove_mem_range(), to exclude hot-removed memory from the crash memory ranges. This function performs the same task as the generic crash_exclude_mem_range() in crash_core.c. The generic helper also ensures that the crash memory ranges remain sorted. So remove the redundant powerpc-specific implementation and instead call crash_exclude_mem_range_guarded() (which internally calls crash_exclude_mem_range()) to exclude the hot-removed memory ranges. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Baoquan he <bhe@redhat.com> Cc: Jinjie Ruan <ruanjinjie@huawei.com> Cc: Hari Bathini <hbathini@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Cc: Shivang Upadhyay <shivangu@linux.ibm.com> Cc: linux-kernel@vger.kernel.org Acked-by: Baoquan He <bhe@redhat.com> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

The crash memory alloc, and the exclude of crashk_res, crashk_low_res and crashk_cma memory are almost identical across different architectures, handling them in the crash core would eliminate a lot of duplication, so do them in the common code. To achieve the above goal, three architecture-specific functions are introduced: - arch_get_system_nr_ranges(). Pre-counts the max number of memory ranges. - arch_crash_populate_cmem(). Collects the memory ranges and fills them into cmem. - arch_crash_exclude_ranges(). Architecture's additional crash memory ranges exclusion, defaulting to empty. Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com> Acked-by: Baoquan He <bhe@redhat.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

The crash memory exclude of crashk_res and crashk_cma memory on powerpc are almost identical to the generic crash_exclude_core_ranges(). By introducing the architecture-specific arch_crash_exclude_mem_range() function with a default implementation of crash_exclude_mem_range(), and using crash_exclude_mem_range_guarded as powerpc's separate implementation, the generic crash_exclude_core_ranges() helper function can be reused. Acked-by: Baoquan He <bhe@redhat.com> Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Commit 35c18f2 ("Add a new optional ",cma" suffix to the crashkernel= command line option") and commit ab47551 ("kdump: implement reserve_crashkernel_cma") added CMA support for kdump crashkernel reservation. Crash kernel memory reservation wastes production resources if too large, risks kdump failure if too small, and faces allocation difficulties on fragmented systems due to contiguous block constraints. The new CMA-based crashkernel reservation scheme splits the "large fixed reservation" into a "small fixed region + large CMA dynamic region": the CMA memory is available to userspace during normal operation to avoid waste, and is reclaimed for kdump upon crash—saving memory while improving reliability. So extend crashkernel CMA reservation support to arm64. The following changes are made to enable CMA reservation: - Parse and obtain the CMA reservation size along with other crashkernel parameters. - Call reserve_crashkernel_cma() to allocate the CMA region for kdump. - Include the CMA-reserved ranges for kdump kernel to use. - Exclude the CMA-reserved ranges from the crash kernel memory to prevent them from being exported through /proc/vmcore, which is already done in the crash core. Update kernel-parameters.txt to document CMA support for crashkernel on arm64 architecture. Acked-by: Rob Herring (Arm) <robh@kernel.org> Acked-by: Baoquan He <bhe@redhat.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Commit 35c18f2 ("Add a new optional ",cma" suffix to the crashkernel= command line option") and commit ab47551 ("kdump: implement reserve_crashkernel_cma") added CMA support for kdump crashkernel reservation. This allows the kernel to dynamically allocate contiguous memory for crash dumping when needed, rather than permanently reserving a fixed region at boot time. So extend crashkernel CMA reservation support to riscv. The following changes are made to enable CMA reservation: - Parse and obtain the CMA reservation size along with other crashkernel parameters. - Call reserve_crashkernel_cma() to allocate the CMA region for kdump. - Include the CMA-reserved ranges for kdump kernel to use, which was already done in of_kexec_alloc_and_setup_fdt(). - Exclude the CMA-reserved ranges from the crash kernel memory to prevent them from being exported through /proc/vmcore, which was already done in the crash core. Update kernel-parameters.txt to document CMA support for crashkernel on riscv architecture. Acked-by: Baoquan He <bhe@redhat.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Paul Walmsley <pjw@kernel.org> # arch/riscv Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

…plug There is a race condition between the kexec_load() system call (crash kernel loading path) and memory hotplug operations that can lead to buffer overflow and potential kernel crash. During crash_prepare_headers(), the following steps occur: 1. arch_get_system_nr_ranges() queries current memory ranges from memblock 2. alloc_cmem() allocates buffer based on queried count 3. arch_crash_populate_cmem() populates ranges from memblock If memory hotplug occurs between step 1 and step 3, the number of ranges can increase, causing out-of-bounds write when populating cmem->ranges[]. This happens because kexec_load() uses kexec_trylock (atomic_t) while memory hotplug uses device_hotplug_lock (mutex), so they don't serialize with each other. Fix by adding lock_device_hotplug()/unlock_device_hotplug() around the critical section in crash_prepare_headers(). The lock is only acquired when CONFIG_MEMORY_HOTPLUG is enabled to avoid overhead on systems without hotplug support. Fixes: dd5f726 ("kexec: support for kexec on panic using new system call") Fixes: 3751e72 ("arm64: kexec_file: add crash dump support") Fixes: 8acea45 ("RISC-V: Support for kexec_file on panic") Fixes: 1bcca86 ("LoongArch: Add crash dump support for kexec_file") Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-03-25T04:12:59Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 135.18 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T04:31:28Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1107.87 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T04:58:38Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1628.56 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T04:59:04Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 24.84 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T04:59:32Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 26.41 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T04:59:34Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.92 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:00:58Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 82.44 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:01:00Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:01:02Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
kdoc
Desc: Detects for kdoc errors
Duration: 0.89 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:01:04Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:01:06Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.28 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:01:07Z

Patch 1: "[v10,1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.30 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:03:39Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 136.43 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:20:18Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 997.45 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:42:45Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1345.89 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:43:11Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 24.86 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:43:39Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 26.57 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:43:42Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.76 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:45:06Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 83.07 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:45:08Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:45:11Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
kdoc
Desc: Detects for kdoc errors
Duration: 0.90 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T05:45:12Z

Patch 2: "[v10,2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:04:21Z

Patch 6: "[v10,6/8] arm64: kexec: Add support for crashkernel CMA reservation"
kdoc
Desc: Detects for kdoc errors
Duration: 0.92 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:04:23Z

Patch 6: "[v10,6/8] arm64: kexec: Add support for crashkernel CMA reservation"
module-param
Desc: Detect module_param changes
Duration: 0.29 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:04:25Z

Patch 6: "[v10,6/8] arm64: kexec: Add support for crashkernel CMA reservation"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:04:27Z

Patch 6: "[v10,6/8] arm64: kexec: Add support for crashkernel CMA reservation"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:06:57Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 136.47 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:25:32Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1112.57 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:52:46Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1632.44 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:53:12Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 24.79 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:53:40Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 26.24 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:53:43Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.22 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:08Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 83.19 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:11Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:14Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
kdoc
Desc: Detects for kdoc errors
Duration: 0.91 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:16Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
module-param
Desc: Detect module_param changes
Duration: 0.29 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:18Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:55:20Z

Patch 7: "[v10,7/8] riscv: kexec: Add support for crashkernel CMA reservation"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T09:57:52Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 136.89 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:16:33Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1118.13 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:43:52Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1638.06 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:44:20Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.37 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:44:48Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 26.43 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:44:50Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.86 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:17Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 84.80 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:19Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:21Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
kdoc
Desc: Detects for kdoc errors
Duration: 0.89 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:23Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:25Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.39 seconds
Result: PASS

linux-riscv-bot · 2026-03-25T10:46:27Z

Patch 8: "[v10,8/8] crash: Fix race condition between crash kernel loading and memory hotplug"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.30 seconds
Result: PASS

ruanjinjie-eng and others added 8 commits March 25, 2026 04:05

linux-riscv-bot closed this Mar 28, 2026

linux-riscv-bot deleted the pw1072012 branch March 28, 2026 08:09

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