From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 82B4FC43458 for ; Tue, 30 Jun 2026 15:04:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=hkhDPMkIn7o4S+p4EJjWg1/vRnrXI2zfxcLsfb3CwqA=; b=UVgZCyoUsT9Y2mGXFuhf5bZJu4 LV6IF2+R8MhcYRmI9WPrqxJxaGkQ2iLMrLMVrbCgaPywimVJjfMBzoe/wM6zF9C9a9tOWb6vC8MKf Irhed+DYCakjaTB1CB4RmJSw1m2haQLpzrASDR2bTQSp/SVGC3Aa01W2vPR1Hn+fXsV/s27b2s3KF Pt03uCTOgOE+R7i/qJK0bfT8usy4fnVnhlzvPD1gDczFsqON0fCxXTG+8LcAeBdrFaZW/tiJ9ZGvf 2MUeSybAkAex88QFQHIjXSXpSAHuyA6cN6F5nsD3xH0RJKZ4CQ+PJyQcM2vDXCYGrZcwR0O2hISvj AiQKoz8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wea0k-0000000HKMy-40V0; Tue, 30 Jun 2026 15:04:30 +0000 Received: from mail-pl1-x62f.google.com ([2607:f8b0:4864:20::62f]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wea0h-0000000HKLs-1Hi4 for linux-arm-kernel@lists.infradead.org; Tue, 30 Jun 2026 15:04:29 +0000 Received: by mail-pl1-x62f.google.com with SMTP id d9443c01a7336-2c9b19bbaefso18171475ad.0 for ; Tue, 30 Jun 2026 08:04:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782831866; x=1783436666; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=hkhDPMkIn7o4S+p4EJjWg1/vRnrXI2zfxcLsfb3CwqA=; b=JZNSfYAcVLBsnN+kmTtrwmHbIcfQwc/wqMDNXUbw3q6iv7S5sNuHWd7/LUxNm4E1h/ tlDA2cLBLkBIrqDAXbjMd+U+zKaAH4l/zp0kuvC5pkg9IF+2ZjVpWSOJke8ANw0ixpId 1mRpj2vb0c8kGSnf2/JBkdqu9fya4gd7osVZEZQ+3KsBZkhPqxdgQLZervC0VrmP7sV3 BTNOEHK+4pddIT1v3qfdL0LdbPWJ9yrfj5rsN+U9ZhKjgTI6Lyxo3achPidrmh+NV/77 SQVglXAHIMwqNunMHhGM71dSTE7+k5PPwpXlG2QHSRJUseWjVM0Ri48g4q920MpVXs91 Bcng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782831866; x=1783436666; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=hkhDPMkIn7o4S+p4EJjWg1/vRnrXI2zfxcLsfb3CwqA=; b=SPITMBTcnMEARwmaFt/ZuiSbL8TKldJqF9hYXlsiuheAQdAS8Zc7f0jAe7CgnJlg87 77KmlZq5F1Cu9G7puxFOTmxoCDh86DQ6+UjgDnDJKirSK6pJF43XZMuB1dpgbnwSKGBz vBdb9RSqrkK48R+5SpqF8jI79zO0uxfLcd255XZDJgrWpval/WcbmFJthrIakZYFdPWi gMdohgf8M/rdJe0EO0Ru5/Crtkwweqi+m32P+LeU12ZfCHsFhgtz7EeXgwk3CGKLFJMF B3NIjUD+FP2Uy59hgtlmlqzwyXmfRAtA0QRIBpWWoYA69NuDAaJ2gc3Z6/NRfv7A8SW4 YkcA== X-Forwarded-Encrypted: i=1; AHgh+RpNLz3wFI0wfeequ6Disv6buPZsVO+QECV+CUC/IbCf2vFjHj2hB2/wlmM+TpaEFG4bU+UY6FmdmBaoHg2Z5RSt@lists.infradead.org X-Gm-Message-State: AOJu0YwEbzFK8y4Hp+qjHhgVumdIYejIZ5CKzArCK/HZVReCVZQhIdoH Prv61/BNTxDQL/EVgWibXaZTDRla87uYhexbvgjQU6Hh+f58zaJ3ck1q X-Gm-Gg: AfdE7ckz8C56mjB0mrWlYC+H927YeRrhVk0KLfzInHk78EU7oxhQzx6IkUKSOnW7XuJ O0hQ/052SuRF3hpOu8VELQko32W4iYVJ8+dQSKC9emoDXr0a3Y3OyikX2wj3uOqmhXVfpyr2KmT mBbbUUSNEXQUVltHRNbJ3Io/BxgCrQSybwcXrBujiaSA2CRx2BbgJmrouCymcnqyd77Fcre9F6X 6h80/F6m8UwtdVHV7i+hjtKIK9kC2hN+cTxDymV0tmXnEq3/yRw8DA17cPyY4xX4WOthaenwbvF Mr0LkO0VhC8RbgVVHlNt+sJ96rsVbMznkRufEhwgUN+LlxroqobG5bi+VNNN1BbYvgT2HAIVPeb MvooGS6o8PD84eNuaHMJtrcTCBb8wCb3qgDnzRFik2ywmtsoPPotqTmvjH3QXNTQaxrbXVzkX3j 5eSJSkRoE= X-Received: by 2002:a17:902:e541:b0:2c9:97a7:71ac with SMTP id d9443c01a7336-2ca2ea23674mr32988355ad.39.1782831866110; Tue, 30 Jun 2026 08:04:26 -0700 (PDT) Received: from ubuntu.. ([110.9.142.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca37a70bc0sm16250465ad.10.2026.06.30.08.04.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jun 2026 08:04:25 -0700 (PDT) From: Sang-Heon Jeon To: rppt@kernel.org, Albert Ou , Andrew Morton , Andrey Ryabinin , Catalin Marinas , Huacai Chen , Madhavan Srinivasan , Michael Ellerman , Muchun Song , Oscar Salvador , Palmer Dabbelt , Paul Walmsley , Russell King , Will Deacon Cc: linux-mm@kvack.org, Sang-Heon Jeon , Alexander Potapenko , Alexandre Ghiti , Andrey Konovalov , "Christophe Leroy (CS GROUP)" , David Hildenbrand , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, Nicholas Piggin , Vincenzo Frascino , WANG Xuerui Subject: [PATCH v3 0/8] treewide: remove unnecessary invalid range checks in memblock iteration loops Date: Wed, 1 Jul 2026 00:04:05 +0900 Message-ID: <20260630150413.1718632-1-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-20260630_080427_512311_89ADFFE5 X-CRM114-Status: GOOD ( 13.34 ) 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 1-6 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 7-8 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. --- Changes from v1 [1] - Add review-by, tested-by tags from v1 - Add missing simliar patches(5,6) to patch series - Change base to rppt/for-next Changes from v2 [2] - Remove unused local variable and braces [1] https://lore.kernel.org/all/20260621145919.1453-1-ekffu200098@gmail.com/ [2] https://lore.kernel.org/all/20260629163736.1606688-1-ekffu200098@gmail.com/ --- Sang-Heon Jeon (8): 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() ARM: remove unreachable invalid range check in kasan_init() powerpc64/kasan: Remove unreachable invalid range check in kasan_init_phys_region() mm: remove unnecessary empty range check in early_calculate_totalpages() mm/hugetlb: remove unnecessary empty range check in hugetlb_bootmem_set_nodes() arch/arm/mm/kasan_init.c | 6 ------ arch/arm64/mm/kasan_init.c | 3 --- arch/loongarch/mm/kasan_init.c | 3 --- arch/powerpc/mm/kasan/init_book3e_64.c | 3 --- arch/powerpc/mm/kasan/init_book3s_64.c | 3 --- arch/riscv/mm/init.c | 2 -- arch/riscv/mm/kasan_init.c | 3 --- mm/hugetlb.c | 7 ++----- mm/mm_init.c | 3 +-- 9 files changed, 3 insertions(+), 30 deletions(-) -- 2.43.0