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([110.9.142.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-37d4f225870sm4544896a91.8.2026.06.21.07.59.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Jun 2026 07:59:28 -0700 (PDT) From: Sang-Heon Jeon To: Albert Ou , Andrew Morton , Andrey Ryabinin , Catalin Marinas , Huacai Chen , Mike Rapoport , Muchun Song , Oscar Salvador , Palmer Dabbelt , Paul Walmsley , Will Deacon Cc: Sang-Heon Jeon , Alexander Potapenko , Alexandre Ghiti , Andrey Konovalov , David Hildenbrand , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, Vincenzo Frascino , WANG Xuerui Subject: [PATCH 0/6] treewide: remove unnecessary invalid range checks in memblock iteration loops Date: Sun, 21 Jun 2026 23:59:10 +0900 Message-ID: <20260621145919.1453-1-ekffu200098@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260621_075930_419580_D5867776 X-CRM114-Status: GOOD ( 10.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The memblock API guarantees that for_each_mem_range() and for_each_mem_pfn_range() never return an invalid range, meaning start is always less than end. Several memblock callers still have unnecessary invalid range checks in their loop bodies, so remove them. Patches 1-4 cover for_each_mem_range() callers. memblock never stores a zero-size region, so the range it returns always has start < end. Some callers apply __va() or __phys_to_virt() before comparing, but these keep start < end too, so the check is unreachable. Patches 5-6 cover for_each_mem_pfn_range() callers. __next_mem_pfn_range() skips any region that contains no whole page, so it only ever returns start_pfn < end_pfn and the check is unnecessary. For reference, commit 36ca7f4be809 ("arm64: mm: Remove bogus stop condition from map_mem() loop") did a similar cleanup in arm64 map_mem(). All these checks are in different trees, so I split the change into one patch per arch/subsystem. The patches are independent and can be applied separately. Sang-Heon Jeon (6): arm64: mm: remove unreachable invalid range check in kasan_init_shadow() LoongArch: remove unreachable invalid range check in kasan_init() riscv: remove unreachable invalid range check in create_linear_mapping_page_table() riscv: remove unreachable invalid range check in kasan_init() mm: remove unnecessary empty range check in early_calculate_totalpages() mm/hugetlb: remove unnecessary empty range check in hugetlb_bootmem_set_nodes() arch/arm64/mm/kasan_init.c | 3 --- arch/loongarch/mm/kasan_init.c | 3 --- arch/riscv/mm/init.c | 2 -- arch/riscv/mm/kasan_init.c | 3 --- mm/hugetlb.c | 3 +-- mm/mm_init.c | 3 +-- 6 files changed, 2 insertions(+), 15 deletions(-) -- 2.43.0