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Thu, 06 Aug 2026 02:37:08 -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 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header Date: Thu, 6 Aug 2026 17:35:19 +0800 Message-ID: <20260806093519.2907771-9-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: rspam11 X-Rspamd-Queue-Id: 01E0F40003 X-Stat-Signature: c6mhxuot1qfjw5hi79mx1a1njqezpuez X-HE-Tag: 1786009029-599064 X-HE-Meta: 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 UI7Rf132 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Wandun Chen Reserve regions (for GPU, DSP, ...) carry no data useful for crash analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to reduce vmcore size and capture time. crash_should_skip_region() now also returns true for MEMBLOCK_NODUMP. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- kernel/crash_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/crash_core.c b/kernel/crash_core.c index fb78b7814f18..8cc9d666bc54 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -269,10 +269,10 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, return 0; } -/* Exclude NOMAP regions from the vmcore. */ +/* Exclude NOMAP and NODUMP regions from the vmcore. */ static bool crash_should_skip_region(struct memblock_region *reg) { - return memblock_is_nomap(reg); + return memblock_is_nomap(reg) || memblock_is_nodump(reg); } static struct crash_mem *alloc_cmem(unsigned int nr_ranges) -- 2.43.0