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Tue, 22 Sep 2026 01:43:58 -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 4/9] crash_core: replace for_each_mem_range() with for_each_mem_region() Date: Tue, 22 Sep 2026 16:42:51 +0800 Message-ID: <20260922084256.1515554-5-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: rspam02 X-Rspamd-Queue-Id: E8572140006 X-Stat-Signature: tunyyrgfesubn7wmehznnznutkhbo5fb X-Rspam-User: X-HE-Tag: 1790066639-316161 X-HE-Meta: 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 Z6J30o88 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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 Acked-by: Baoquan He --- 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 d0cc2496dc09..c7acb2e449df 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -270,6 +270,12 @@ 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; @@ -285,22 +291,25 @@ 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