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Wed, 21 Oct 2026 01:32:33 -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 v9 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header Date: Wed, 21 Oct 2026 16:30:11 +0800 Message-ID: <20261021083011.2170525-9-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261021083011.2170525-1-chenwandun1@gmail.com> References: <20261021083011.2170525-1-chenwandun1@gmail.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: hiimrj1xra5kdw1hhsc33718gf988bjz X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 3E063A0008 X-Rspam-User: X-HE-Tag: 1792571556-583113 X-HE-Meta: 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 oO2FUgL1 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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 e161c8b65e00..0e2ddc933b22 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -283,10 +283,10 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges) } #ifdef CONFIG_ARCH_KEEP_MEMBLOCK -/* 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); } unsigned int __weak arch_get_system_nr_ranges(void) -- 2.43.0