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Wed, 02 Sep 2026 00:32:36 -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, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org, baoquan.he@linux.dev, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, m.szyprowski@samsung.com Cc: mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr, hpa@zytor.com, 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 v6 05/10] crash_core: replace for_each_mem_range() with for_each_mem_region() Date: Wed, 2 Sep 2026 15:31:11 +0800 Message-ID: <20260902073116.802752-6-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260902073116.802752-1-chenwandun1@gmail.com> References: <20260902073116.802752-1-chenwandun1@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 33DE11C0007 X-Stat-Signature: b8ggpgbmxdhj64rniedxqfgegx6fhb6i X-Rspam-User: X-HE-Tag: 1788334359-319269 X-HE-Meta: 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 p0KhZ/re 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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 3adee1ae120c..bd64cf585795 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