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Sun, 4 Oct 2026 08:13:08 -0400 (EDT) From: FUJITA Tomonori To: anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, ojeda@kernel.org, richard@nod.at Cc: a.hindborg@kernel.org, acourbot@nvidia.com, aliceryhl@google.com, bjorn3_gh@protonmail.com, boqun@kernel.org, dakr@kernel.org, daniel.almeida@collabora.com, david@davidgow.net, gary@garyguo.net, linux-um@lists.infradead.org, lossin@kernel.org, tamird@kernel.org, tmgross@umich.edu, work@onurozkan.dev, rust-for-linux@vger.kernel.org, FUJITA Tomonori Subject: [PATCH v1] rust: arch/um: Fix loading Rust modules Date: Sun, 4 Oct 2026 21:12:30 +0900 Message-ID: <20261004121230.373216-1-tomo@flapping.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261004_051322_690540_3CE54500 X-CRM114-Status: UNSURE ( 8.11 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@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-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org From: FUJITA Tomonori Rust modules fail to load on x86_64 UML: # insmod rnull_mod.ko subarch: rnull_mod: Unknown rela relocation: 9 insmod: can't insert 'rnull_mod.ko': invalid module format arch/um/Makefile adds -Crelocation-model=pie to KBUILD_RUSTFLAGS. This comes after -Crelocation-model=static in the top-level Makefile, so all Rust code on UML, both built-in code and modules, is built as PIE. In PIE mode, rustc accesses statics in other crates through the GOT and emits R_X86_64_GOTPCREL (9) relocations. UML uses the x86 module loader, and it does not handle them. Remove the flag. Rust code, both built-in code and modules, then uses the static relocation model, the same as C code. Modules still fail to load with a larger mem=, such as mem=512M, because Rust code uses the small code model while C code uses -mcmodel=large. This is a separate problem. Tested with clang 20 and rustc 1.90: vmlinux builds and boots, and rnull_mod.ko loads with mem=32M. Reported-by: Zigit Zo Link: https://lore.kernel.org/rust-for-linux/62F5EEA0B866E9E0+20240903130606.292935-1-zig@iorw.io/ Assisted-by: LLM Signed-off-by: FUJITA Tomonori --- arch/um/Makefile | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/um/Makefile b/arch/um/Makefile index 937639edc295..c4a99073f014 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -62,8 +62,6 @@ KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \ -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \ -D__close_range=kernel__close_range -KBUILD_RUSTFLAGS += -Crelocation-model=pie - KBUILD_AFLAGS += $(ARCH_INCLUDE) USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \ base-commit: 2dee3d3adcadcc57d62ba6608cd02f50b0c10264 -- 2.43.0