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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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