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Thu, 06 Aug 2026 02:36:11 -0700 (PDT) From: Wandun Chen 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 3/8] of: reserved_mem: mark /reserved-memory entries with MEMBLOCK_NODUMP Date: Thu, 6 Aug 2026 17:35:14 +0800 Message-ID: <20260806093519.2907771-4-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260806093519.2907771-1-chenwandun1@gmail.com> References: <20260806093519.2907771-1-chenwandun1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wandun Chen Mark non-dumpable reserved-memory regions with MEMBLOCK_NODUMP so kdump can omit them from the vmcore. The marking is guarded by CONFIG_CRASH_DUMP so non-kdump kernels do not pay the cost of splitting memblock.memory entries at NODUMP boundaries. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- drivers/of/of_reserved_mem.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 7b1616b9c6c2..f38d11df6f15 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -674,6 +674,9 @@ static void __init fdt_init_reserved_mem_node(unsigned long node, const char *un rmem->name ? rmem->name : "unknown"); } + if (IS_ENABLED(CONFIG_CRASH_DUMP) && !rmem->dumpable) + memblock_mark_nodump(rmem->base, rmem->size); + reserved_mem_count++; } -- 2.43.0