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Tue, 22 Sep 2026 01:44:49 -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 v7 8/9] of: reserved_mem: mark /memreserve/ entries as MEMBLOCK_NODUMP Date: Tue, 22 Sep 2026 16:42:55 +0800 Message-ID: <20260922084256.1515554-9-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260922084256.1515554-1-chenwandun1@gmail.com> References: <20260922084256.1515554-1-chenwandun1@gmail.com> Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev 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 Acked-by: Marek Szyprowski --- drivers/of/fdt.c | 1 + drivers/of/of_private.h | 1 + drivers/of/of_reserved_mem.c | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 286fd4db6312..9a727941b5af 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1286,6 +1286,7 @@ 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(); + fdt_mark_memreserve_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 505735732c13..6497404ec751 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -188,6 +188,7 @@ 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); +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 f29a07e8fb23..a42cf6eac55b 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -251,6 +251,39 @@ 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 < (u64)rmem->base + (u64)rmem->size && + (u64)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