[PATCH v6 10/10] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header
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REVIEWED: 1 (0M)
From: Wandun Chen <hidden>
Date: 2026-09-02 07:33:43
Also in:
kexec, linux-devicetree, linux-iommu, linux-mm, linux-riscv, lkml, loongarch
Subsystem:
kdump, the rest · Maintainers:
Andrew Morton, Baoquan He, Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Linus Torvalds
Revision v6 of 3 in this series; 1 review trailer.
Revisions (3)
- v3 [diff vs current]
- v4 [diff vs current]
- v6 current
From: Wandun Chen <redacted> Reserve regions (for GPU, DSP, ...) carry no data useful for crash analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to reduce vmcore size and capture time. crash_should_skip_region() now also returns true for MEMBLOCK_NODUMP. Signed-off-by: Wandun Chen <redacted> Tested-by: Meijing Zhao <redacted> --- kernel/crash_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index bd64cf585795..b0e618e13588 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c@@ -270,10 +270,10 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, return 0; } -/* Exclude NOMAP regions from the vmcore. */ +/* Exclude NOMAP and NODUMP regions from the vmcore. */ static bool crash_should_skip_region(struct memblock_region *reg) { - return memblock_is_nomap(reg); + return memblock_is_nomap(reg) || memblock_is_nodump(reg); } static struct crash_mem *alloc_cmem(unsigned int nr_ranges)
--
2.43.0