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([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c7f5afb1e0sm26263075ad.29.2026.06.25.11.43.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jun 2026 11:43:53 -0700 (PDT) From: Sang-Heon Jeon To: Andrey Ryabinin , Russell King Cc: Sang-Heon Jeon , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, Vincenzo Frascino Subject: [PATCH] ARM: remove unreachable invalid range check in kasan_init() Date: Fri, 26 Jun 2026 03:40:36 +0900 Message-ID: <20260625184037.630815-1-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-20260625_114355_848218_7FBE88D5 X-CRM114-Status: UNSURE ( 9.32 ) X-CRM114-Notice: Please train this message. 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 kasan_init() maps each memblock region with for_each_mem_range(), which guarantees pa_start < pa_end. Then it skips any region with pa_start >= arm_lowmem_limit, so pa_start < arm_lowmem_limit is guaranteed as well. When pa_end <= arm_lowmem_limit, pa_start < pa_end means start < end, so the start >= end check is unreachable. When pa_end > arm_lowmem_limit, end is clamped to __va(arm_lowmem_limit), and pa_start < arm_lowmem_limit means start < end, so the check is unreachable as well. No functional change. Signed-off-by: Sang-Heon Jeon --- arch/arm/mm/kasan_init.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c index c6625e808bf8..1f7c74c5df9e 100644 --- a/arch/arm/mm/kasan_init.c +++ b/arch/arm/mm/kasan_init.c @@ -262,12 +262,6 @@ void __init kasan_init(void) &pa_start, &pa_end, &arm_lowmem_limit); end = __va(arm_lowmem_limit); } - if (start >= end) { - pr_info("Skipping invalid memory block %pa-%pa (virtual %p-%p)\n", - &pa_start, &pa_end, start, end); - continue; - } - create_mapping(start, end); } -- 2.43.0