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Wed, 21 Oct 2026 01:32:18 -0700 (PDT) Received: from intel.company.local ([122.11.210.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8a0895e273bsm600653b3a.41.2026.10.21.01.31.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 01:32:09 -0700 (PDT) From: Wandun Chen To: robh@kernel.org, baoquan.he@linux.dev, rppt@kernel.org, m.szyprowski@samsung.com Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, chenhuacai@kernel.org, kernel@xen0n.name, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, saravanak@kernel.org, akpm@linux-foundation.org, pasha.tatashin@soleen.com, pratyush@kernel.org, ruirui.yang@linux.dev, robin.murphy@arm.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, kexec@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: [PATCH v9 7/8] of: reserved_mem: mark /reserved-memory entries with MEMBLOCK_NODUMP Date: Wed, 21 Oct 2026 16:30:10 +0800 Message-ID: <20261021083011.2170525-8-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261021083011.2170525-1-chenwandun1@gmail.com> References: <20261021083011.2170525-1-chenwandun1@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 and either CONFIG_KEXEC_FILE or CONFIG_CRASH_HOTPLUG, so kernels that do not build or update crash ELF headers do not pay the cost of splitting memblock.memory entries at NODUMP boundaries. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao Acked-by: Marek Szyprowski Reviewed-by: Rob Herring (Arm) --- drivers/of/fdt.c | 1 + drivers/of/of_private.h | 1 + drivers/of/of_reserved_mem.c | 18 ++++++++++++++++++ 3 files changed, 20 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index ecc923102622..a5f223a74b7e 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1285,6 +1285,7 @@ void __init unflatten_device_tree(void) /* Save the statically-placed regions in the reserved_mem array */ fdt_scan_reserved_mem_late(); + fdt_mark_reserve_mem_nodump(); /* Populate an empty root node when bootloader doesn't provide one */ if (!fdt) { diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 0ae16da066e2..505735732c13 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -187,6 +187,7 @@ static inline struct device_node *__of_get_dma_parent(const struct device_node * int fdt_scan_reserved_mem(void); void __init fdt_scan_reserved_mem_late(void); +void __init fdt_mark_reserve_mem_nodump(void); bool of_fdt_device_is_available(const void *blob, unsigned long node); diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 8c9d6395d6a3..db2bf76000d2 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -677,6 +677,24 @@ static void __init fdt_init_reserved_mem_node(unsigned long node, const char *un reserved_mem_count++; } +void __init fdt_mark_reserve_mem_nodump(void) +{ + struct reserved_mem *rmem; + int i; + + if (!IS_ENABLED(CONFIG_CRASH_DUMP)) + return; + + if (!IS_ENABLED(CONFIG_KEXEC_FILE) && !IS_ENABLED(CONFIG_CRASH_HOTPLUG)) + return; + + for (i = 0; i < reserved_mem_count; i++) { + rmem = &reserved_mem[i]; + if (rmem->size && !rmem->dumpable) + memblock_mark_nodump(rmem->base, rmem->size); + } +} + struct rmem_assigned_device { struct device *dev; struct reserved_mem *rmem; -- 2.43.0