On 12/27/2025 8:29 PM, Bruce Ashfield wrote:
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On Sat, Dec 27, 2025 at 7:33 AM <[email protected]> wrote:
From: Harish Sadineni <[email protected]>
This patch series introduces Rust support into the linux-yocto kernel recipe
and related build infrastructure in the Yocto Project. The goal is to enable
building the Linux kernel with Rust components and provide support for building
kernel module which is written in rust and also provide support to build
rust kernel modules in sdk.
And this series adds test for Linux Rust sample and also added support for
out-of-tree kernel
module written in Rust as well as associated test.
What are the changes in this version compared to the last ?
I didn't get a chance to look at the previous series in detail, but will look
at this one. Knowing what was done in the different iterations is
helpful in guiding what I look at.
The previous series was RFC v4, "Enable Rust support for Linux kernel"
(https://lists.openembedded.org/g/openembedded-core/message/226623).
In addition, Yoann Congal posted RFC v2, "Kernel Rust out-of-tree module
support"
(https://lists.openembedded.org/g/openembedded-core/message/227281),
which builds on top of RFC v4.
The current patch series is a unified version that combines both efforts.
Compared to the earlier series, the main changes are:
*Kernel configuration fragments have been moved to yocto-kernel-cache.
*The kernel fragments have been removed from SRC_URI and from the files
directory previously stored under recipes-kernel/linux/files.
*Updated the "[PATCH 11/16] selftest/cases/runtime_test: Add test for
Linux Rust sample" by appending KERNEL_EXTRA_FEATURES:append = '
features/kernel-sample/kernel-rust-sample.scc' instead of adding this
directly in the linux-yocto recipe.
Thanks,
Harish
Bruce
Summary of patches:
- Patch 01: Extend 'bindgen-cli' to support 'nativesdk', allowing it to be
available in the SDK environment.
- Patch 02: Add required dependencies ('clang-native', 'rust-native',
'bindgen-cli-native') to the kernel to support Rust binding generation.
- Patch 03: Install the Rust standard library source ('library/') into
`work-shared` and which will be later copied to
linux-yocto recipe-sysroot-native.
- Patch 04: Added 'rust-kernel' to DISTRO_FEATURES_FILTER_NATIVE and
DISTRO_FEATURES_FILTER_NATIVESDK, the 'rust-kernel' feature automatically
propagates from target DISTRO_FEATURES to native/nativesdk builds
- Patch 05: Stage the Rust sources into `recipe-sysroot-native` for kernel
build compatibility, making them visible during native builds.
- Patch 06: Update `kernel-yocto.bbclass` to invoke `make rustavailable` during
'do_kernel_configme', ensuring Rust readiness.
- Patch 07: Add kernel configuration support for Rust (via 'kernel-rust.scc'),
enabling the Rust build options in kernel config.
- Patch 08: Fixed buildpaths errors when rust is enabled for kernel by
appending --remap-path-prefix to RUST_DEBUG_REMAP
- Patch 09: Disabling ccache when rust-kernel is enabled for linux-yocto.
- Patch 10: Copy Rust kernel sources into kernel-devsrc build directory which
will be required while running 'make prepare' in sdk.
- Patch 11: Added oe-selftest case for the Linux Rust sample.
- patch 12: Copying include/config/auto.conf in STAGING_KERNEL_BUILDDIR
- patch 13: Export artifacts needed for out-of-tree Rust compilation
- patch 14: Prepare out-of-tree rust module compilation
- patch 15: Added rust-out-of-tree-module recipe in meta-skeleton layer
- patch 16: Added rust-out-of-tree selftest
Patches have been build-tested successfully on:
- qemuarm64
- qemux86-64
Benchmark test-result for x86-64:
+-------------------------------+------------+-----------+-----------+-----------+
| DISTRO_FEATURES | real | user | sys | FS
usage |
+-------------------------------+------------+-----------+-----------+-----------+
| rust-kernel (enabled) | 46m1.720s | 0m28.864s | 0m3.696s | 58 GB
|
| rust-kernel (disabled) | 30m1.053s | 0m20.091s | 0m2.748s | 33 GB
|
+-------------------------------+------------+-----------+-----------+-----------+
The increased in time & fs is due to kernel rust dependencies in
linux-yocto.
Harish Sadineni (9):
bindgen-cli: extend BBCLASSEXTEND to include nativesdk
linux-yocto: conditionally add clang/rust/bindgen-cli-native to
DEPENDS
rust: install Rust library sources for 'make rustavailable' support
bitbake.conf: Include "rust-kernel" in native/nativesdk feature
filters
kernel-yocto: stage rustlib sources for linux-yocto 'make
rustavailable' support
kernel-yocto: add rust support via "make rustavailable" in
do_kernel_configme
linux-yocto: enable Rust support in kernel configuration
kernel-yocto: Fix for buildpaths errors when rust is enabled for
kernel
kernel-devsrc: copying rust-kernel source to $kerneldir/build
Yoann Congal (7):
kernel-yocto.bbclass: Disable ccache when rust-kernel is enabled
selftest/cases/runtime_test: Add test for Linux Rust sample
kernel.bbclass: Copy include/config/auto.conf in
STAGING_KERNEL_BUILDDIR
kernel.bbclass: Export artifacts needed for out-of-tree Rust
compilation
module.bbclass: Prepare out-of-tree rust module compilation
meta-skeleton: Add rust-out-of-tree-module recipe
runtime_test: Add rust-out-of-tree selftest
.../rust-out-of-tree-module_git.bb | 18 ++++++++++
meta/classes-recipe/kernel-yocto.bbclass | 28 +++++++++++++++
meta/classes-recipe/kernel.bbclass | 19 ++++++++++
meta/classes-recipe/module.bbclass | 8 +++++
meta/conf/bitbake.conf | 4 +--
meta/lib/oeqa/selftest/cases/runtime_test.py | 35 +++++++++++++++++++
.../bindgen-cli/bindgen-cli_0.72.1.bb | 2 +-
meta/recipes-devtools/rust/rust_1.91.1.bb | 17 +++++++++
meta/recipes-kernel/linux/kernel-devsrc.bb | 4 +++
meta/recipes-kernel/linux/linux-yocto.inc | 2 ++
meta/recipes-kernel/linux/linux-yocto_6.16.bb | 1 +
meta/recipes-kernel/linux/linux-yocto_6.18.bb | 1 +
12 files changed, 136 insertions(+), 3 deletions(-)
create mode 100644
meta-skeleton/recipes-kernel/rust-out-of-tree-module/rust-out-of-tree-module_git.bb
--
2.49.0
--
- Thou shalt not follow the NULL pointer, for chaos and madness await
thee at its end
- "Use the force Harry" - Gandalf, Star Trek II
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