From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=115.124.30.110 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792754188; b=UI9UjdLdyK9j1citL6Pm6G4xm3mwKoCaPGeL9C85vRE97ud/0z1AdWKupll2yB+lXmeY hOCMh54iTSTTe9CsYtg7GR6qaoPtwJvX4HVrAD4sdPA0BbZj6I9i5HnBfRxQY4t9fQe+s qCAGxZDZu8a5SOQCBnCYEFl0G6I/dZEs+6sVpwK8ytpIBs+I5od75qDPU6A3XsAY5CjCJ +m8gVWTcFb3F9aR0k4PUzOJRBS7ve8lZJ1L+0XUC43gzVYV05Hfix5TnDs7dzKXVWhtYr 0Eb/BuLfoGAsvWbMbHfpr1stjv7T1/szFdi8o/3DoCYrYvvE6knK9HOcmcV74sghDCg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792754188; h=DMARC-Filter:DKIM-Signature:X-Alimail-AntiSpam:Received:From:To:Cc: Subject:Date:Message-ID:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=XR763hCbspNzvt9Ja5KlngGTT7u+E0yj2HR4cp4PfjA=; b=5D9kGX3ZatoOELcPVxcYA248EG8PAKmemtKaQW6k8PmQptqL6fJ7pyOzgrH996GX5JZ0 Ioo4TfyztZLVpPPS601N1OyLgySn9D2B+Ad36FaD8LUMIGu+tLGG/QoEtjnUIOzGtaEVF MNHEIgAOVSYtu6lqCxB9Cq+cUVaVOKTk+Ci8lz2pw6ED13FYSn4VnqxxXYnr2QfOmskOx OY8NTKG54c2FUT9pSpTwyMwOIOksaUnKg9gi1wKGYrDNN3CMy7tvHtS9DDFgkBmVu8+TQ EgZJgIJ+Xl7eFvbFq7cWzG4R5oa2pkw7w8y4fJ9qHd57n2hifQUcOZPa22QNOyfAw7A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b=VOKOktfN; arc=none smtp.remote-ip=115.124.30.110 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) (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 031DE606A31D; Fri, 23 Oct 2026 11:16:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 031DE606A31D Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; 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=VOKOktfN DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1792754182; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=XR763hCbspNzvt9Ja5KlngGTT7u+E0yj2HR4cp4PfjA=; b=VOKOktfNPAzaim72kYSazBCh6gx5ZL/gqeej4lSeikUiMwLpC1406E1W7mVyy5bNKk0V9q8akphaVXy1iW93n2wcid2keeBmHqA+GfeM+CriihYxupB9XKfIpyFt0RZt1/VkUZTfKGh2k0yWh0siW9f7yQgS6oFOw4HulwHCObo= 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-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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