[PW_SID:1101350] kdump: reduce vmcore size and capture time by linux-riscv-bot · Pull Request #2021 · linux-riscv/linux

linux-riscv-bot · 2026-05-27T07:04:12Z

PR for series 1101350 applied to workflow__riscv__fixes

Name: kdump: reduce vmcore size and capture time
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1101350
Version: 3

Prepare for an upcoming change that appends /memreserve/ entries to reserved_mem[]; such entries have no name. No functional change. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

…_DUMP=n Prepare for an upcoming change that excludes non-dumpable reserved regions from the kdump vmcore and will call crash_exclude_mem_range() from generic, non-arch code. No functional change. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

… fails The global pointer 'reserved_mem' continues to reference the reserved_mem_array which lives in __initdata if alloc_reserved_mem_array() fails. of_reserved_mem_lookup() is exported for post-init use, that would dereference freed memory and trigger a use-after-free. So reset reserved_mem_count to 0 when alloc_reserved_mem_array() fails. Fixes: 00c9a45 ("of: reserved_mem: Add code to dynamically allocate reserved_mem array") Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

…emory entry Prepare for storing /memreserve/ entries in the reserved_mem array. Zero total_reserved_mem_cnt if no valid /reserved-memory entry, instead of keeping it's initial value of MAX_RESERVED_REGIONS, this allows accounting /memreserve entries based on total_reserved_mem_cnt in a follow-up patch. No functional change. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

…rved_mem_late() Prepare for storing /memreserve/ entries in the reserved_mem array. alloc_reserved_mem_array is skipped if the device tree lacks a /reserved-memory node, pointer 'reserved_mem' continues to reference the reserved_mem_array which lives in __initdata, storing /memreserve/ entries into reserved_mem_array would result in metadata loss, and an out-of-bounds memory access will occur if the device tree contains more than MAX_RESERVED_REGIONS /memreserve/ entries. So split alloc_reserved_mem_array() from fdt_scan_reserved_mem_late(), and call alloc_reserved_mem_array() whether or not there is a /reserved-memory node. No functional change. The actual /memreserve/ population is added in a follow-up patch. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Add a 'dumpable' flag to struct reserved_mem so the kernel can decide whether a reserved area should be included in the kdump vmcore. Most reserved regions are owned by devices and do not contain data useful for kernel crash analysis, so excluding them by default is the right behaviour. Reusable CMA regions are different: pages in a CMA region are handed back to the buddy allocator and may contain key data for crash analysis, so set dumpable to true in rmem_cma_setup(). Suggested-by: Rob Herring <robh@kernel.org> Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Tested-by: Meijing Zhao <zhaomeijing@lixiang.com> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/all/20260506144542.GA2072596-robh@kernel.org/ Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

/memreserve/ is used by firmware or bootloaders, such regions hold no useful data for crash analysis, they should be excluded from the kdump vmcore, so save /memreserve/ entries into the reserved_mem array for later exclusion. If a /memreserve/ entry overlaps any dumpable reserved region, mark the whole memreserve entry dumpable as well. This may keep slightly more memory in vmcore than strictly necessary, but avoids splitting entries and never drops data that may be useful for crash analysis. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Tested-by: Meijing Zhao <zhaomeijing@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Add two helpers to exclude non-dumpable regions for arch-specific code. - of_reserved_mem_kdump_nr_ranges() returns the count of regions that are not dumpable. Each excluded region may split an existing crash_mem range into two, so callers use this to calculate crash_mem allocation size. - of_reserved_mem_kdump_exclude() walks reserved_mem[] and calls crash_exclude_mem_range() for every non-dumpable region. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Tested-by: Meijing Zhao <zhaomeijing@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Reserved memory regions are excluded from vmcore by default unless marked dumpable. Honor the dumpable flag to filter out device firmware regions (e.g., GPU, DSP, modem) reserved via device tree, since they typically contain data not useful for kernel crash analysis and can significantly increase vmcore size. Use of_reserved_mem_kdump_exclude() to perform the exclusion, and pre-size the crash_mem array via of_reserved_mem_kdump_nr_ranges(). Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Tested-by: Meijing Zhao <zhaomeijing@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Apply the same non-dumpable reserved memory filtering to RISC-V kdump as was done for arm64. Use of_reserved_mem_kdump_exclude() to drop flagged regions from the elfcorehdr PT_LOAD segments, and of_reserved_mem_kdump_nr_ranges() to pre-size the crash_mem array. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

…mcore Apply the same non-dumpable reserved memory filtering to LoongArch kdump as was done for arm64. Use of_reserved_mem_kdump_exclude() to drop flagged regions from the elfcorehdr PT_LOAD segments, and of_reserved_mem_kdump_nr_ranges() to pre-size the crash_mem array. Signed-off-by: Wandun Chen <chenwandun@lixiang.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-05-27T07:09:46Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 114.48 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:28:24Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1116.56 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:55:44Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1638.50 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:56:06Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 19.58 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:56:28Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 20.75 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:56:31Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.62 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:57:50Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 77.78 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:57:52Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:57:55Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
kdoc
Desc: Detects for kdoc errors
Duration: 0.73 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:57:57Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
module-param
Desc: Detect module_param changes
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:57:59Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T07:58:01Z

Patch 1: "[v3,01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup()"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:00:11Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 114.85 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:19:19Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1145.58 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:47:37Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1696.05 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:47:59Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 19.90 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:48:21Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 20.85 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:48:24Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.61 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T08:49:42Z

Patch 2: "[v3,02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 76.38 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:41:56Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 76.88 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:41:58Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:42:01Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
kdoc
Desc: Detects for kdoc errors
Duration: 0.72 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:42:04Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:42:06Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:42:09Z

Patch 9: "[v3,09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T14:44:19Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 115.12 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:03:04Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1122.44 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:30:29Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1642.60 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:30:51Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 19.58 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:31:14Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 21.13 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:31:17Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.62 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:36Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 76.87 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:38Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:42Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
kdoc
Desc: Detects for kdoc errors
Duration: 0.72 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:44Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
module-param
Desc: Detect module_param changes
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:46Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:32:49Z

Patch 10: "[v3,10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:35:01Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 116.69 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T15:52:00Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1016.76 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:14:52Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1370.25 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:15:14Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 19.46 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:15:37Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 20.86 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:15:39Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.62 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:16:59Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 77.60 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:17:01Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:17:04Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
kdoc
Desc: Detects for kdoc errors
Duration: 0.73 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:17:06Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
module-param
Desc: Detect module_param changes
Duration: 0.28 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:17:08Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-27T16:17:11Z

Patch 11: "[v3,11/11] loongarch: kdump: exclude non-dumpable reserved memory regions from vmcore"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

Wandun Chen added 11 commits May 27, 2026 07:04

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