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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 4236016000B X-Stat-Signature: ksfuut7of5bkwgjytbrmycg5ae87thkd X-HE-Tag: 1786008985-800838 X-HE-Meta: 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 EzqFQT06 ztyLW4UX+YEaE8eFzmrOrRCDJKSyC0RuDPV4Jt3BixP8o1H2YMa+aH9MnwbMjSkT5hHBh2+rNqAwQOVbzZl40Dx8KnnLhwhrwibz/xb9IKRbH+oWYRmX4GzjtqL144kC8WRZamFIEqY5jKtmtStthLYmeHWrPMvNcq6pMzkLfzMcXlNB8fTNqAtQxCE2Bt4xuA50P9Q/7w7h7E1UB0SQhuYmDkXLTUG7VwP0L1DlEgogaz9hkgFXMMqW/+zuWpK7bLPsrpD9M65R6tsqk4bAN2KkFHdgkizq8VgzFAfySU7rrPXZXRc1LnVteZCclh9OaiZ0DiWr2PSHglrpee5i1Y94EfAKdUAji8g2yXvX34TDe1r4FXAqmo2+xO8bKGVUpfMuohh84mx//9PR4uevRF/H1pyKHvds7D71AbNuvdl33Y7HDal4kww9P2VB9RxUYGaXnmSIcBOY7Atm0cULrJCPcjpt9ulXT0vcrRx3Jl3d+TRwGI1odijaLLg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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