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[v2,05/15] kernel-yocto: enable Rust kernel support via rustavailable and staged rustlib sources

Message ID 20251230141540.1974380-6-Harish.Sadineni@windriver.com
State Changes Requested
Headers show
Series Enable rust support for linux kernel | expand

Commit Message

Harish Sadineni Dec. 30, 2025, 2:15 p.m. UTC 
From: Harish Sadineni <Harish.Sadineni@windriver.com>

When building the Linux kernel with Rust support enabled (DISTRO_FEATURES += "rust-kernel"),
additional preparation steps are required for the kernel configuration phase.

The kernel Rust build system expects the Rust standard library sources to be
available under:

${STAGING_DIR_NATIVE}/usr/lib/rustlib/src/rust

These sources are required by make rustavailable, which prepares the kernel
tree for Rust integration by validating the toolchain, generating bindings,
and setting up Rust-specific infrastructure needed for building Rust kernel
components and modules.

This change adds support for Rust-enabled kernel builds by:

-Staging the Rust standard library sources into the native sysroot when
 rust-kernel is enabled.

-Extending do_kernel_configme dependencies to include rust-native,
 clang-native, and bindgen-cli-native.

-Invoking make rustavailable during do_kernel_configme() to prepare the
 kernel build environment for Rust.

Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/classes-recipe/kernel-yocto.bbclass | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/meta/classes-recipe/kernel-yocto.bbclass b/meta/classes-recipe/kernel-yocto.bbclass
index e53bf15194..dda235d4d0 100644
--- a/meta/classes-recipe/kernel-yocto.bbclass
+++ b/meta/classes-recipe/kernel-yocto.bbclass
@@ -463,8 +463,20 @@  do_kernel_configme[depends] += "virtual/cross-binutils:do_populate_sysroot"
 do_kernel_configme[depends] += "virtual/cross-cc:do_populate_sysroot"
 do_kernel_configme[depends] += "bc-native:do_populate_sysroot bison-native:do_populate_sysroot"
 do_kernel_configme[depends] += "kern-tools-native:do_populate_sysroot"
+RUST_KERNEL_TASK_DEPENDS ?=  "${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', ' \
+                                  rust-native:do_populate_sysroot \
+                                  clang-native:do_populate_sysroot \
+                                  bindgen-cli-native:do_populate_sysroot', '', d)}"
+do_kernel_configme[depends] += "${RUST_KERNEL_TASK_DEPENDS}"
 do_kernel_configme[dirs] += "${S} ${B}"
 do_kernel_configme() {
+	if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', 'true', 'false', d)}; then
+		if [ ! -d ${STAGING_LIBDIR_NATIVE}/rustlib/src/rust ]; then
+			mkdir -p ${STAGING_LIBDIR_NATIVE}/rustlib/src/
+			cp -r ${TMPDIR}/work-shared/rust ${STAGING_LIBDIR_NATIVE}/rustlib/src/.
+		fi
+	fi
+
 	do_kernel_metadata config
 
 	# translate the kconfig_mode into something that merge_config.sh
@@ -506,6 +518,10 @@  do_kernel_configme() {
 		echo "# Global settings from linux recipe" >> ${B}/.config
 		echo "CONFIG_LOCALVERSION="\"${LINUX_VERSION_EXTENSION}\" >> ${B}/.config
 	fi
+        
+	if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', 'true', 'false', d)}; then
+		oe_runmake -C ${S} O=${B} rustavailable
+	fi
 }
 
 addtask kernel_configme before do_configure after do_patch