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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-Rspamd-Server: rspam10 X-Stat-Signature: 8jm3ueuf4aohxstorineoahnzc5xrcqz X-Rspamd-Queue-Id: 12BC11C0003 X-Rspam-User: X-HE-Tag: 1782053969-31912 X-HE-Meta: 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 +d9/9PCX 1ErV6xwmC1sCpmmPZwZ9QjuOqjBZyRsoZWaPuG+wBRt47zts0I3vmt/B1aLB30QBHYjWBzIBdzdjPT9LAU1G8flLO4mmpeykJr6y/jqdNvXcQgQ+gIeke6Es4J7v9f9Wz5VkzoQZXnJQgBgFcOTH8joqA8JQUK7k+qtZsuefe8LWNXWx8I8NomziY9924M3fknhVLMF6s6v/Uim8rjVUSNsjZz9zNg+COoZM2KGx0jkWpUubb+azXDf/FZ0c+NIO2/oHg/5Pis5tl8l8sndqIo0gRXa1VHDWnwYbqgubR+A6eLum0TO3/Cnvetr6Xuoln+sCzCgVBFKdzARkfgLavAtevmqs3x0ld70un5ekWA1ECicPSDDz+BErldIEPIjuYHZFkCLTh9I+ZM4CyNaqvzrmdH5GFgrpOLY4LXaTN1EEbcHwyKgeyJfclZ17nr0k0TJr11gZFmBvJPBg+wQ8BAQRBYw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 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 EB5FECDB46D for ; Sun, 21 Jun 2026 14:59:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=+tFh6ivvyZlnN3d3RFFVUHqw83IsLkUmCfI4keoe6dw=; b=Z/XFISJqFnoPpT dzx/5ilQCEfKBqjsN7CEcI7H/MmZiP2jrxQ4xMFhUiaM2AB9siW1xG1k11NLJRezzCVOFZc5NBYcy qfUq633002vy3EIWvWFXMhosGehW1eR98I5lGJb5ttgNLSUFD56RDT2hKS+zkDyLEbqWljJW80piD y8HE9EeD8rrcyDMjbdVK49sv6e60CtoL0VtyroH5igWDO7GsEk+N8Wq49r+dcCzZRiOvkCSbxRNjL 3Dm3L5yoUHKI4G/XglUkQSs/8hVnzZ5ZDu4I2MtjxCTlmXsMi8Abe+Xs+J7xROE4UTnFcYqfjU8RB MstdjsXLG12h3ep6DOIg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wbJe1-000000040gZ-3KzR; Sun, 21 Jun 2026 14:59:33 +0000 Received: from mail-pj1-x102a.google.com ([2607:f8b0:4864:20::102a]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wbJdy-000000040fo-1QFj for linux-riscv@lists.infradead.org; Sun, 21 Jun 2026 14:59:32 +0000 Received: by mail-pj1-x102a.google.com with SMTP id 98e67ed59e1d1-37ce68a54f8so2099847a91.0 for ; Sun, 21 Jun 2026 07:59:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782053969; x=1782658769; 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=q9Iy1NRZrQdiv+3iSOUUb7XMLeE6HcnU1eSibV26qpo=; b=CXg67tffKdFqaGjef7gZPcn5nal10rdC3XJs5v8GFM55BwkdGor8V/7gEfjypMqhIj ajS0srat8p46Hg6gO7cK16/rdm1cb/yppmhUds5KvPFOkbT7q3JJ+uW/9odkVwenQhP+ 7rJcIvxgH5xxRl8Gk/jotToxUU7h0VMrDR1LHTE0EXg/CMguBwH4PNoy1XF0qQyM+K+X m09Ii6H/aYOJkA8S8BxNjqMqenrYKuAcXZn9az4bd6uagVGe8x3OQm+gEi27wZQeTtd3 2jWmWJ97zvz3IdxcLZibXErB/gJJPxkOel4F7pwY/u/nyiQyXOO0x7qVPV+jh3Olz75w PrYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782053969; x=1782658769; 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=q9Iy1NRZrQdiv+3iSOUUb7XMLeE6HcnU1eSibV26qpo=; b=odnT3r7Jqcfko2h9zX6Rc2jhbNr9k1NkZJLw8zRotfuNlaxIU3ErrqU0QozznrIxAs v37CD93AVM2zs2ipOprlUyHD/MMJtnWU/8DtQVD07t7ja2bPF6qoPuYDZmjmUaAJG/vj 90NaDwzoJSXZQMqCGWQKJw5tL56jB2NjIKNdZ5YaVO5W+FP3rO1R217aU/wOaII5Y6ug RGG5n2Rbvh/1TQUsRF0EzBpyGIvSbHs62hkLlFTP57xGjqUgvB9xbWpp1GCyUy//wYc3 LCua2yxZX2IJ+EU6a8oQ+vIOQxZcKPwBoMkzG7ri/jJtWEkXCWmbwVlK7rEUI+Ej1I73 dNSA== X-Forwarded-Encrypted: i=1; AHgh+RrDFQUi7jyhwaX1V04FmUJefuNPTwdCHcP9CKPkpamlyDUkXQROp7pkZR8JZ3mlP1022wTiSwx1AgzhTA==@lists.infradead.org X-Gm-Message-State: AOJu0YwKOjLcAe3ecllgSvUJ5KcIo9mAYsIYEfladhWOFuutHjBG0XdM 2KA2BEGjEzPty01XnDJ3SAikzOQlYZYQQZuDKsmgdxNqtCOBjOh+yU2dC1Uo9GPN X-Gm-Gg: AfdE7cloVyObRpb0vcxqnrYgav3ylBRsw8YeY76fs/MeHDc4T7T8MsEjCOBmZt0McC3 7Ag9pAX+TPcybqklYVwrnTVDuFLpPP+VgQA5ykXb69geGShFZmVkvFwlbw5bpSJGDNRJ9p9LFMA IXGwO/uHHcdyPsgdDhYx9lESf+4/i3sixHoe8Xyit1+mgLFN1u/zlUL9uxONZR7NnneKps1AxHg XtbklnYf0VtCxk27cBNZcqJ4HOCPqpXccyA6++E3KmN5Q4rcrJxlu/KW6CoV2g5CikdVsyTnn5P hqtJlmlDCOESz6VU4Ls79KOkV9pfs1Qzq4HlF1sw14FBPlGzF82Ld95mA3Ja+BkUang4wR2q195 r75J7wkAUrnwYPMBRt3V/YkJHjWbKUKkq3TYnJOsfvxxI0+1SqJiRQgullR5WLI7MEP6sAwhn15 +rGTpxmqEnAz/DjphOBw== X-Received: by 2002:a17:90b:1807:b0:368:9da3:c496 with SMTP id 98e67ed59e1d1-37d1ea12264mr9696809a91.24.1782053968739; Sun, 21 Jun 2026 07:59:28 -0700 (PDT) Received: from ubuntu.. ([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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260621_075930_420888_F34B8DA9 X-CRM114-Status: UNSURE ( 9.44 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv