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Wed, 21 Oct 2026 01:30:42 -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 1/8] riscv: build crash_mem ranges from memblock instead of resource tree Date: Wed, 21 Oct 2026 16:30:04 +0800 Message-ID: <20261021083011.2170525-2-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-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 9E0F4C0009 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=unavailable autolearn_force=no version=4.0.1 X-Stat-Signature: yxzjbtdec637zeqw383rkczbtbn5jhbw X-HE-Tag: 1792571444-206965 X-HE-Meta: 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 VXQgi7Sk JAT2qA3W18FnsCdZMt9ScjcFn6PHaaKKAsi9Iadw+0+SoE79J3iCQqU/bA+Uxrzbah/qdAiW8yEdp67V0Ixxuhp+YITWr/C3AsQTRS7HokEUEm34Ih/EjErJv8FxdbYCLlmQpBC3QMYnWABcOBpLtpU3P2oIHbLId10LGovwnRi2uZTklqoiek7KpNAD+eWSG4kzddYw80c9k8vYl0GhqdE9JzVelpE1pzfVV8X/OtaX0J+zYMZ5cIpr5w3TpUxkDgpSuzPffYfxSJ/aVxQUgYHMc6preiRK9jxGydKJoAEQyH1DM6SCIT8oX9IG15xYVoJ+BAIWslUjfwCK9gy2FNmlVzIrq4tTUEQVjHipueLbncB3ZLDHJgDMoadvMXiCPEYCVHZR2bbDtl4BNNf4DJM6ma3rKXAt7yxeATkcUKmQJcFpc5Mp8v7CIpX8CyT8klL95rcudxbeA+G9HLDjQgq/0G94+88HwO7CIrU6RceXgj4SvizSMHBAdrDyc/0ZH/wU++bg2uKvQGIjl3u0h9Awjvw== 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 Replace walk_system_ram_res() with for_each_mem_range(). A later patch introduces MEMBLOCK_NODUMP in memblock, the reserved-memory regions marked with MEMBLOCK_NODUMP can be excluded from the vmcore by walking memblock. for_each_mem_range() iterates memblock.memory, which is freed after init unless ARCH_KEEP_MEMBLOCK is selected. riscv needs ARCH_KEEP_MEMBLOCK to filter reserved memory from the vmcore, so extend its condition (ACPI || KEXEC) with CRASH_DUMP. arm64 and loongarch already select ARCH_KEEP_MEMBLOCK unconditionally. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao Acked-by: Baoquan He --- arch/riscv/Kconfig | 2 +- arch/riscv/kernel/machine_kexec_file.c | 31 ++++++++++---------------- 2 files changed, 13 insertions(+), 20 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e7891a2a89da..e21d0bab77ee 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -58,7 +58,7 @@ config RISCV select ARCH_HAS_UBSAN select ARCH_HAS_VDSO_ARCH_DATA select ARCH_HAVE_NMI_SAFE_CMPXCHG - select ARCH_KEEP_MEMBLOCK if ACPI || KEXEC + select ARCH_KEEP_MEMBLOCK if ACPI || KEXEC || CRASH_DUMP select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c index 26cd2a8bd0cd..808e872f4063 100644 --- a/arch/riscv/kernel/machine_kexec_file.c +++ b/arch/riscv/kernel/machine_kexec_file.c @@ -37,39 +37,32 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image) } #ifdef CONFIG_CRASH_DUMP -static int get_nr_ram_ranges_callback(struct resource *res, void *arg) -{ - unsigned int *nr_ranges = arg; - - (*nr_ranges)++; - return 0; -} - unsigned int arch_get_system_nr_ranges(void) { unsigned int nr_ranges = 2 + crashk_cma_cnt; /* For exclusion of crashkernel region */ + u64 i; + phys_addr_t start, end; - walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback); + for_each_mem_range(i, &start, &end) + nr_ranges++; return nr_ranges; } -static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg) +int arch_crash_populate_cmem(struct crash_mem *cmem) { - struct crash_mem *cmem = arg; + u64 i; + phys_addr_t start, end; - cmem->ranges[cmem->nr_ranges].start = res->start; - cmem->ranges[cmem->nr_ranges].end = res->end; - cmem->nr_ranges++; + for_each_mem_range(i, &start, &end) { + cmem->ranges[cmem->nr_ranges].start = start; + cmem->ranges[cmem->nr_ranges].end = end - 1; + cmem->nr_ranges++; + } return 0; } -int arch_crash_populate_cmem(struct crash_mem *cmem) -{ - return walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback); -} - static char *setup_kdump_cmdline(struct kimage *image, char *cmdline, unsigned long cmdline_len) { -- 2.43.0