From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D93E60A2600 for ; Fri, 23 Oct 2026 11:16:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=OVt9k1xH; dkim=pass (1024-bit key, unprotected) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b=dEp9P8wt 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:References:In-Reply-To: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:List-Unsubscribe-Post: List-Owner; bh=XR763hCbspNzvt9Ja5KlngGTT7u+E0yj2HR4cp4PfjA=; b=OVt9k1xH3IhVVS GPo+K7Mzp03GMFkmLLf0CfcaagQtRA/cVwGf/+xVytcouTVtaTm42qnk9Pyzb4dPVm4B9zcZ4kL2K Wd9hrxXhIoeJ2u1xgztNWG1iVL0wCI6AiO1Tg32MjhDYUZrFJfKIDAlBYeNvlH74IJ0U5TP52/26L MVyONn1Jcg+8smCXvYvhPI6S44Kw73FzvN/Krv5d3/IzHr9BUpVp/4zPukLrTPJ9QgpiVFgj3VNv2 Vuui1JseieAaGrJy7lOlJ+gOZw+XMBa+5/dM6T9sEg5m5XMp8hlGjTocgrSZf+8PWjMjaXQsQOmS1 GKy50ZE04krmozOcF7Uw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xKDGC-0000000GDOd-1iwr; Fri, 23 Oct 2026 11:16:32 +0000 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xKDG9-0000000GDMp-0oVw; Fri, 23 Oct 2026 11:16:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1792754183; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=XR763hCbspNzvt9Ja5KlngGTT7u+E0yj2HR4cp4PfjA=; b=dEp9P8wtKFFnU9ygvZhkHsuOeVWzaAuomqIWciSFKZ+L9UE6UfM4JQuBFeedv7e1nkFVu/G9DWjpVO9pG0NcEJKTnwwH/Ok3T4uD7ImX0uhE+QmFFFjyO2eT1qQo9hfITP+QeEXi28Yz//e+8iFUpGCH0XDaw2AC6/kdBK/c2UM= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R211e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045133197;MF=cp0613@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0XDM1n5K_1792754181; Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XDM1n5K_1792754181 cluster:ay36) by smtp.aliyun-inc.com; Fri, 23 Oct 2026 19:16:21 +0800 From: Chen Pei To: pjw@kernel.org, palmer@dabbelt.com, alex@ghiti.fr, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, graf@amazon.com, shuah@kernel.org Cc: guoren@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, kexec@lists.infradead.org Subject: [PATCH 1/4] riscv: Call early_ioremap_setup() before parsing the DTB Date: Fri, 23 Oct 2026 19:16:09 +0800 Message-ID: <20261023111612.2134-2-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261023111612.2134-1-cp0613@linux.alibaba.com> References: <20261023111612.2134-1-cp0613@linux.alibaba.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261023_041629_420782_6849B9A7 X-CRM114-Status: UNSURE ( 9.77 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -17.6 (-----------------) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" X-Spam-Status: No, score=-26.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 early_ioremap_setup() fills in the slot_virt[] array whose entries the return value of early_ioremap()/early_memremap() is composed from. On RISC-V it ran after parse_dtb(), so an early_memremap() reached from the device tree scan returned "offset + 0" -- NULL for a page aligned address -- and the caller could only report a mapping failure. This stayed latent because nothing reached from parse_dtb() asked for an early mapping before; the DT based kexec handover parsing is the first such caller, as kho_populate() maps the handover FDT and the scratch descriptor array with early_memremap(). Move the call to the top of setup_arch(), which is how arm64 and x86 already order it (early_fixmap_init()/early_ioremap_init() before setup_machine_fdt()/parse_setup_data()). The BTMAP window is mapped into early_pg_dir by setup_vm(), and RISC-V neither calls early_ioremap_reset() nor defines __late_set_fixmap(), so the virtual addresses stay identical across the switch to the final page tables and nothing else in setup_arch() depends on the previous ordering. Signed-off-by: Chen Pei --- arch/riscv/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index d79f99b86033..45e2ef9d32fa 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -308,12 +308,12 @@ extern void __init init_rt_signal_env(void); void __init setup_arch(char **cmdline_p) { + early_ioremap_setup(); parse_dtb(); setup_initial_init_mm(_stext, _etext, _edata, _end); *cmdline_p = boot_command_line; - early_ioremap_setup(); sbi_init(); jump_label_init(); parse_early_param(); -- 2.50.1