[PATCH v5 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header

From: Wandun Chen <chenwandun1@gmail.com>
To: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org,
	pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
	robh@kernel.org, saravanak@kernel.org, rppt@kernel.org,
	baoquan.he@linux.dev, pasha.tatashin@soleen.com,
	pratyush@kernel.org, m.szyprowski@samsung.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, loongarch@lists.linux.dev,
	linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	linux-mm@kvack.org, kexec@lists.infradead.org,
	iommu@lists.linux.dev
Cc: kernel@xen0n.name, alex@ghiti.fr, akpm@linux-foundation.org,
	ruirui.yang@linux.dev, robin.murphy@arm.com
Subject: [PATCH v5 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header
Date: Thu,  6 Aug 2026 17:35:19 +0800	[thread overview]
Message-ID: <20260806093519.2907771-9-chenwandun1@gmail.com> (raw)
In-Reply-To: <20260806093519.2907771-1-chenwandun1@gmail.com>

From: Wandun Chen <chenwandun@lixiang.com>

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 <chenwandun@lixiang.com>
Tested-by: Meijing Zhao <zhaomeijing@lixiang.com>
---
 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 fb78b7814f18..8cc9d666bc54 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -269,10 +269,10 @@ 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


