[PATCH 09/11] riscv: kdump: exclude no-dump reserved memory regions from vmcore

Chen Wandun
2026-04-29T07:00:13Z

Apply the same no-dump reserved memory filtering to RISC-V kdump as was
done for arm64. Use of_reserved_mem_exclude_no_dump() to drop flagged
regions from the elfcorehdr PT_LOAD segments, and
of_reserved_mem_no_dump_nr_ranges() to pre-size the crash_mem array.

Signed-off-by: Chen Wandun <chenwandun@lixiang.com>
---
arch/riscv/kernel/machine_kexec_file.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c
index 54e2d9552e93..012885ac9b79 100644
--- a/arch/riscv/kernel/machine_kexec_file.c
+++ b/arch/riscv/kernel/machine_kexec_file.c
@@ -10,6 +10,7 @@
#include <linux/elf.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_reserved_mem.h>
#include <linux/libfdt.h>
#include <linux/types.h>
#include <linux/memblock.h>
@@ -63,6 +64,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)

nr_ranges = 1; /* For exclusion of crashkernel region */
walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
+ nr_ranges += of_reserved_mem_no_dump_nr_ranges();

cmem = kmalloc_flex(*cmem, ranges, nr_ranges);
if (!cmem)
@@ -76,6 +78,8 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)

/* Exclude crashkernel region */
ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
+ if (!ret)
+ ret = of_reserved_mem_exclude_no_dump(cmem);
if (!ret)
ret = crash_prepare_elf64_headers(cmem, true, addr, sz);

--
2.43.0