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Thu, 15 Oct 2026 20:10:02 -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 v8 4/8] crash_core: replace for_each_mem_range() with for_each_mem_region() Date: Fri, 16 Oct 2026 11:08:51 +0800 Message-ID: <20261016030855.4062882-5-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261016030855.4062882-1-chenwandun1@gmail.com> References: <20261016030855.4062882-1-chenwandun1@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 43E974000B X-Rspam-User: X-Stat-Signature: jx85s8jkuw19ooepwkizr7yo5d9wqtpf X-HE-Tag: 1792120204-136321 X-HE-Meta: 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 fEvnmt10 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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 8a861a946e26..e161c8b65e00 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -283,25 +283,34 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges) } #ifdef CONFIG_ARCH_KEEP_MEMBLOCK +/* Exclude NOMAP regions from the vmcore. */ +static bool crash_should_skip_region(struct memblock_region *reg) +{ + return memblock_is_nomap(reg); +} + 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