[PATCH v7 4/9] crash_core: replace for_each_mem_range() with for_each_mem_region()
From: Wandun Chen <hidden>
Date: 2026-09-22 08:44:08
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
From: Wandun Chen <redacted> for_each_mem_range() skips MEMBLOCK_NOMAP regions implicitly. Switch the weak defaults to for_each_mem_region(), which exposes struct memblock_region and per-region flags, and filter NOMAP regions explicitly via the new crash_should_skip_region() helper. This prepares for a subsequent patch to extend the skip filter. No functional change. Signed-off-by: Wandun Chen <redacted> Tested-by: Meijing Zhao <redacted> Acked-by: Baoquan He <baoquan.he@linux.dev> --- kernel/crash_core.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-)
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index d0cc2496dc09..c7acb2e449df 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c@@ -270,6 +270,12 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, return 0; } +/* Exclude NOMAP regions from the vmcore. */ +static bool crash_should_skip_region(struct memblock_region *reg) +{ + return memblock_is_nomap(reg); +} + static struct crash_mem *alloc_cmem(unsigned int nr_ranges) { struct crash_mem *cmem;
@@ -285,22 +291,25 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges) unsigned int __weak arch_get_system_nr_ranges(void) { unsigned int nr_ranges = 2 + crashk_cma_cnt; /* crashk_res + crashk_low_res, +CMA splits */ - phys_addr_t start, end; - u64 i; + struct memblock_region *reg; - for_each_mem_range(i, &start, &end) + for_each_mem_region(reg) { + if (crash_should_skip_region(reg)) + continue; nr_ranges++; + } return nr_ranges; } int __weak arch_crash_populate_cmem(struct crash_mem *cmem) { - phys_addr_t start, end; - u64 i; + struct memblock_region *reg; - for_each_mem_range(i, &start, &end) { - cmem->ranges[cmem->nr_ranges].start = start; - cmem->ranges[cmem->nr_ranges].end = end - 1; + for_each_mem_region(reg) { + if (crash_should_skip_region(reg)) + continue; + cmem->ranges[cmem->nr_ranges].start = reg->base; + cmem->ranges[cmem->nr_ranges].end = reg->base + reg->size - 1; cmem->nr_ranges++; } return 0;
--
2.43.0