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Thu, 06 Aug 2026 02:36:57 -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 7/8] crash_core: replace for_each_mem_range() with for_each_mem_region() Date: Thu, 6 Aug 2026 17:35:18 +0800 Message-ID: <20260806093519.2907771-8-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: rspam03 X-Stat-Signature: gmupz93ybpdqey9t5j8fn5r4wuz7xf57 X-Rspamd-Queue-Id: 59E2C160003 X-HE-Tag: 1786009019-895598 X-HE-Meta: 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 L0ri3ODx 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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 for_each_mem_range() skips MEMBLOCK_NOMAP regions implicitly. Switch the weak defaults to for_each_mem_region(), which exposes struct memblock_region and per-region flags, and filter NOMAP regions explicitly via the new crash_should_skip_region() helper. This prepares for a subsequent patch to extend the skip filter. No functional change. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- kernel/crash_core.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/kernel/crash_core.c b/kernel/crash_core.c index 77285ae3ce60..fb78b7814f18 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -269,6 +269,12 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, return 0; } +/* Exclude NOMAP regions from the vmcore. */ +static bool crash_should_skip_region(struct memblock_region *reg) +{ + return memblock_is_nomap(reg); +} + static struct crash_mem *alloc_cmem(unsigned int nr_ranges) { struct crash_mem *cmem; @@ -284,22 +290,25 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges) unsigned int __weak arch_get_system_nr_ranges(void) { unsigned int nr_ranges = 2 + crashk_cma_cnt; /* crashk_res + crashk_low_res, +CMA splits */ - phys_addr_t start, end; - u64 i; + struct memblock_region *reg; - for_each_mem_range(i, &start, &end) + for_each_mem_region(reg) { + if (crash_should_skip_region(reg)) + continue; nr_ranges++; + } return nr_ranges; } int __weak arch_crash_populate_cmem(struct crash_mem *cmem) { - phys_addr_t start, end; - u64 i; + struct memblock_region *reg; - for_each_mem_range(i, &start, &end) { - cmem->ranges[cmem->nr_ranges].start = start; - cmem->ranges[cmem->nr_ranges].end = end - 1; + for_each_mem_region(reg) { + if (crash_should_skip_region(reg)) + continue; + cmem->ranges[cmem->nr_ranges].start = reg->base; + cmem->ranges[cmem->nr_ranges].end = reg->base + reg->size - 1; cmem->nr_ranges++; } return 0; -- 2.43.0