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Tue, 22 Sep 2026 01:45:07 -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 9/9] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header Date: Tue, 22 Sep 2026 16:42:56 +0800 Message-ID: <20260922084256.1515554-10-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: B400B1C0007 X-Stat-Signature: i8cecx545xsa16szwkfz9mkxthto95wz X-Rspam-User: X-HE-Tag: 1790066709-269351 X-HE-Meta: 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 TcjOP/AR 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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 Acked-by: Baoquan He --- 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 c7acb2e449df..fdfeee5afa1a 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -270,10 +270,10 @@ 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