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Message-ID: <20240223-palatable-quintuple-ed221a517407@spud> Date: Fri, 23 Feb 2024 13:38:05 +0000 From: Conor Dooley <conor@...nel.org> To: linux-riscv@...ts.infradead.org Cc: conor@...nel.org, Conor Dooley <conor.dooley@...rochip.com>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Jonathan Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev Subject: [PATCH v2 3/3] RISC-V: enable building 64-bit kernels with rust support From: Miguel Ojeda <ojeda@...nel.org> The rust modules work on 64-bit RISC-V, with no twiddling required. Select HAVE_RUST and provide the required flags to kbuild so that the modules can be used. The Makefile and Kconfig changes are lifted from work done by Miguel in the Rust-for-Linux tree, hence his authorship. Following the rabbit hole, the Makefile changes originated in a script, created based on config files originally added by Gary, hence his co-authorship. 32-bit is broken in core rust code, so support is limited to 64-bit: ld.lld: error: undefined symbol: __udivdi3 As 64-bit RISC-V is now supported, add it to the arch support table, taking the opportunity to sort the table in alphabetical order. Co-developed-by: Gary Guo <gary@...yguo.net> Signed-off-by: Gary Guo <gary@...yguo.net> Signed-off-by: Miguel Ojeda <ojeda@...nel.org> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com> --- Documentation/rust/arch-support.rst | 1 + arch/riscv/Kconfig | 1 + arch/riscv/Makefile | 2 ++ 3 files changed, 4 insertions(+) diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst index 73203ba1e901..9e18a81fc2ef 100644 --- a/Documentation/rust/arch-support.rst +++ b/Documentation/rust/arch-support.rst @@ -16,6 +16,7 @@ support corresponds to ``S`` values in the ``MAINTAINERS`` file. Architecture Level of support Constraints ============= ================ ============================================== ``loongarch`` Maintained - +``riscv`` Maintained ``riscv64`` only. ``um`` Maintained ``x86_64`` only. ``x86`` Maintained ``x86_64`` only. ============= ================ ============================================== diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 5c59e00405e3..3eaae08e1d5c 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -142,6 +142,7 @@ config RISCV select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ + select HAVE_RUST if 64BIT select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index ebbe02628a27..22fdb1e83744 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -34,6 +34,8 @@ ifeq ($(CONFIG_ARCH_RV64I),y) KBUILD_AFLAGS += -mabi=lp64 KBUILD_LDFLAGS += -melf64lriscv + + KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 else BITS := 32 UTS_MACHINE := riscv32 -- 2.43.0
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