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Thu, 06 Aug 2026 02:36:23 -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 4/8] of: reserved_mem: mark /memreserve/ entries as MEMBLOCK_NODUMP Date: Thu, 6 Aug 2026 17:35:15 +0800 Message-ID: <20260806093519.2907771-5-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 The /memreserve/ entries are memory reservations made by the bootloader or firmware, their contents are not needed for kernel crash analysis, so mark them MEMBLOCK_NODUMP to have kdump omit them from the vmcore. Entries that overlap a dumpable region (such as CMA) are left unmarked, because the pages of a dumpable region may carry crash-relevant data. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- drivers/of/fdt.c | 2 ++ drivers/of/of_private.h | 1 + drivers/of/of_reserved_mem.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index a64afc3ded3d..2aa888997e9b 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1286,6 +1286,8 @@ void __init unflatten_device_tree(void) /* Save the statically-placed regions in the reserved_mem array */ fdt_scan_reserved_mem_late(); + fdt_mark_memreserve_nodump(); + /* Populate an empty root node when bootloader doesn't provide one */ if (!fdt) { fdt = (void *) __dtb_empty_root_begin; diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 0ae16da066e2..667ce9e46aab 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_memreserve_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 f38d11df6f15..f0683b5d77b3 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -251,6 +251,38 @@ static void __init __rmem_check_for_overlap(void) } } +void __init fdt_mark_memreserve_nodump(void) +{ + u64 base, size; + int n; + const void *fdt = initial_boot_params; + + if (!IS_ENABLED(CONFIG_CRASH_DUMP)) + return; + + if (!fdt) + return; + + for (n = 0; ; n++) { + int i; + + if (fdt_get_mem_rsv(fdt, n, &base, &size)) + break; + if (!size) + break; + + for (i = 0; i < reserved_mem_count; i++) { + struct reserved_mem *rmem = &reserved_mem[i]; + + if (rmem->dumpable && base < rmem->base + rmem->size && + rmem->base < base + size) + break; + } + if (i == reserved_mem_count) + memblock_mark_nodump(base, size); + } +} + /** * fdt_scan_reserved_mem_late() - Scan FDT and initialize remaining reserved * memory regions. -- 2.43.0