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Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XE27L01_1793693380 cluster:ay36) by smtp.aliyun-inc.com; Tue, 03 Nov 2026 16:09:41 +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 v2 2/5] riscv: Call early_ioremap_setup() before parsing the DTB Date: Tue, 3 Nov 2026 16:09:23 +0800 Message-ID: <20261103080926.2079-3-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261103080926.2079-1-cp0613@linux.alibaba.com> References: <20261103080926.2079-1-cp0613@linux.alibaba.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 0608EA0003 X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=4.0.1 X-Stat-Signature: qqpg86c3hr58wsr4gd7o1nwimfk6p7tc X-HE-Tag: 1793693390-143066 X-HE-Meta: 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 0lthF35v oN3Dtx4/xuokEknf3xqQ1pL+yCmtWMW7qT98Wr0HzZhIH5+a4U+0jS4tk7VBzFaOrtexForm2K+63GlKDMupeoIeW4FuE11eeZXAYbNS7EwAc0wRBfKrW2TR9pmsUwG/fft+i23RZuEinS8EcBZ1NU2uSOw74QxGxtznryu1/ZIexQKFfb281iqbU+Uj9HQMdUeAKOkQHu9ZrccUQHSS8pD5Q3419RMjMRS+kJa7FhwAcAuTbRfkH651ZRIM1S5z+ymD7RnVL2oebeMkao3u23dQOlm13gk+O1Mf2b4d368yGS/o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: 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