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format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 5A458O3Y2608395 On 2025-10-23 7:25 a.m., Sadineni, Harish via lists.openembedded.org wrot= e: > From: Harish Sadineni > > Add initial support for building the Linux kernel with Rust enabled: > > - Introduce `rust.cfg` to set Rust-related kernel config options, inclu= ding: > - `CONFIG_RUST`, `CONFIG_HAVE_RUST`, and `CONFIG_RUST_IS_AVAILABLE` > - Rust sample modules and developer checks (overflow/debug assertion= s) > - Disable BTF and module versioning for compatibility > > - Add `rust.scc` to include `rust.cfg` via `kconf` in the kernel featur= e stack > > - Update `linux-yocto_${PV}.bb` to: > - Append `rust.scc` to `SRC_URI` and `KERNEL_FEATURES` > - Suppress `buildpaths` QA warning due to Rust path inclusion during= builds > > Signed-off-by: Harish Sadineni > --- > meta/recipes-kernel/linux/files/rust.cfg | 20 ++++++++++++++++++= + > meta/recipes-kernel/linux/files/rust.scc | 1 + This is fine for an RFC but at some point, when Bruce asks for an=20 non-RFC version, I expect that you will need to move this to the yocto-kenrel-cache,=20 perhaps under: https://git.yoctoproject.org/yocto-kernel-cache/tree/cfg Take a look at the yocto-kernel-cache repo and docs: https://docs.yoctoproject.org/kernel-dev/advanced.html if you haven't already. > meta/recipes-kernel/linux/linux-yocto_6.16.bb | 4 ++++ > 3 files changed, 25 insertions(+) > create mode 100644 meta/recipes-kernel/linux/files/rust.cfg > create mode 100644 meta/recipes-kernel/linux/files/rust.scc > > diff --git a/meta/recipes-kernel/linux/files/rust.cfg b/meta/recipes-ke= rnel/linux/files/rust.cfg > new file mode 100644 > index 0000000000..293438e8e0 > --- /dev/null > +++ b/meta/recipes-kernel/linux/files/rust.cfg > @@ -0,0 +1,20 @@ > +CONFIG_RUST=3Dy > +CONFIG_SAMPLES_RUST=3Dy > +CONFIG_SAMPLE_RUST_MINIMAL=3Dy > +CONFIG_SAMPLE_RUST_PRINT=3Dy > +CONFIG_SAMPLE_RUST_HOSTPROGS=3Dy > +CONFIG_RUST_DEBUG_ASSERTIONS=3Dy > +CONFIG_RUST_OVERFLOW_CHECKS=3Dy > +CONFIG_RUST_BUILD_ASSERT_ALLOW=3Dy > +# Disable module versioning > +CONFIG_MODVERSIONS=3Dn > + > +# Disable BTF debug info > +CONFIG_DEBUG_INFO_BTF=3Dn > + > +# Rust availability > +CONFIG_RUST_IS_AVAILABLE=3Dy > + > +# Indicate Rust support present > +CONFIG_HAVE_RUST=3Dy You'll have to review this list to divide it up into: =C2=A0 1. a minimal rust.cfg and perhaps =C2=A0 2. a rust-samples.cfg =C2=A0 3. a rust-debug.cfg=C2=A0 if that's really what=20 CONFIG_RUST_DEBUG_ASSERTIONS and friends are doing:=20 https://cateee.net/lkddb/web-lkddb/RUST_DEBUG_ASSERTIONS.html Also,=20 you'll need to explain and justify each option or set of options more=20 clearly in the commit log. As Bruce said, the next steps are: 1. Rust being optional and off by default 2. Rust binary / prebuilt=20 components to minimize the overhead and dependencies of rust and related=20 tools on the kernel. Anyway, this is a super start and I understand you have a v2 almost=20 ready that makes kenrel rust-support be optional so send that now and=20 we'll see what the next step after that is. Thanks, ../Randy > + > diff --git a/meta/recipes-kernel/linux/files/rust.scc b/meta/recipes-ke= rnel/linux/files/rust.scc > new file mode 100644 > index 0000000000..4686d9ce5e > --- /dev/null > +++ b/meta/recipes-kernel/linux/files/rust.scc > @@ -0,0 +1 @@ > +kconf hardware rust.cfg > diff --git a/meta/recipes-kernel/linux/linux-yocto_6.16.bb b/meta/recip= es-kernel/linux/linux-yocto_6.16.bb > index 2188c7fed2..fda964e78d 100644 > --- a/meta/recipes-kernel/linux/linux-yocto_6.16.bb > +++ b/meta/recipes-kernel/linux/linux-yocto_6.16.bb > @@ -77,3 +77,7 @@ KERNEL_FEATURES:append:powerpc64le =3D " arch/powerpc= /powerpc-debug.scc" > # Check again during next major version upgrade > KERNEL_FEATURES:remove:riscv32 =3D "features/debug/debug-kernel.scc" > INSANE_SKIP:kernel-vmlinux:qemuppc64 =3D "textrel" > +INSANE_SKIP:kernel-vmlinux =3D "buildpaths" > +INSANE_SKIP:kernel-dbg =3D "buildpaths" > +SRC_URI +=3D"file://rust.scc" > +KERNEL_FEATURES +=3D "rust.scc" > > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > Links: You receive all messages sent to this group. > View/Reply Online (#225242):https://lists.openembedded.org/g/openembedd= ed-core/message/225242 > Mute This Topic:https://lists.openembedded.org/mt/115908712/3616765 > Group Owner:openembedded-core+owner@lists.openembedded.org > Unsubscribe:https://lists.openembedded.org/g/openembedded-core/unsub [r= andy.macleod@windriver.com] > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > --=20 # Randy MacLeod # Wind River Linux --------------PWcNqMTh6byx0b1UrhRlFUHA Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit


On 2025-10-23 7:25 a.m., Sadineni, Harish via lists.openembedded.org wrote:
From: Harish Sadineni <Harish.Sadineni@windriver.com>

Add initial support for building the Linux kernel with Rust enabled:

- Introduce `rust.cfg` to set Rust-related kernel config options, including:
  - `CONFIG_RUST`, `CONFIG_HAVE_RUST`, and `CONFIG_RUST_IS_AVAILABLE`
  - Rust sample modules and developer checks (overflow/debug assertions)
  - Disable BTF and module versioning for compatibility

- Add `rust.scc` to include `rust.cfg` via `kconf` in the kernel feature stack

- Update `linux-yocto_${PV}.bb` to:
  - Append `rust.scc` to `SRC_URI` and `KERNEL_FEATURES`
  - Suppress `buildpaths` QA warning due to Rust path inclusion during builds

Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/recipes-kernel/linux/files/rust.cfg      | 20 +++++++++++++++++++
 meta/recipes-kernel/linux/files/rust.scc      |  1 +
This is fine for an RFC but at some point, when Bruce asks for an non-RFC version,
I expect that you will need to move this to the yocto-kenrel-cache, perhaps under:

https://git.yoctoproject.org/yocto-kernel-cache/tree/cfg

Take a look at the yocto-kernel-cache repo and docs:
  https://docs.yoctoproject.org/kernel-dev/advanced.html
if you haven't already.

 meta/recipes-kernel/linux/linux-yocto_6.16.bb |  4 ++++
 3 files changed, 25 insertions(+)
 create mode 100644 meta/recipes-kernel/linux/files/rust.cfg
 create mode 100644 meta/recipes-kernel/linux/files/rust.scc

diff --git a/meta/recipes-kernel/linux/files/rust.cfg b/meta/recipes-kernel/linux/files/rust.cfg
new file mode 100644
index 0000000000..293438e8e0
--- /dev/null
+++ b/meta/recipes-kernel/linux/files/rust.cfg
@@ -0,0 +1,20 @@
+CONFIG_RUST=y
+CONFIG_SAMPLES_RUST=y
+CONFIG_SAMPLE_RUST_MINIMAL=y
+CONFIG_SAMPLE_RUST_PRINT=y
+CONFIG_SAMPLE_RUST_HOSTPROGS=y
+CONFIG_RUST_DEBUG_ASSERTIONS=y
+CONFIG_RUST_OVERFLOW_CHECKS=y
+CONFIG_RUST_BUILD_ASSERT_ALLOW=y
+# Disable module versioning
+CONFIG_MODVERSIONS=n
+
+# Disable BTF debug info
+CONFIG_DEBUG_INFO_BTF=n
+
+# Rust availability
+CONFIG_RUST_IS_AVAILABLE=y
+
+# Indicate Rust support present
+CONFIG_HAVE_RUST=y


You'll have to review this list to divide it up into:
  1. a minimal rust.cfg and perhaps
  2. a rust-samples.cfg
  3. a rust-debug.cfg  if that's really what CONFIG_RUST_DEBUG_ASSERTIONS and friends are doing: https://cateee.net/lkddb/web-lkddb/RUST_DEBUG_ASSERTIONS.html Also, you'll need to explain and justify each option or set of options more clearly in the commit log.


As Bruce said, the next steps are:
1. Rust being optional and off by default 2. Rust binary / prebuilt components to minimize the overhead and dependencies of rust and related tools on the kernel.

Anyway, this is a super start and I understand you have a v2 almost ready that makes kenrel rust-support be optional so send that now and we'll see what the next step after that is.


Thanks,

../Randy

+
diff --git a/meta/recipes-kernel/linux/files/rust.scc b/meta/recipes-kernel/linux/files/rust.scc
new file mode 100644
index 0000000000..4686d9ce5e
--- /dev/null
+++ b/meta/recipes-kernel/linux/files/rust.scc
@@ -0,0 +1 @@
+kconf hardware rust.cfg
diff --git a/meta/recipes-kernel/linux/linux-yocto_6.16.bb b/meta/recipes-kernel/linux/linux-yocto_6.16.bb
index 2188c7fed2..fda964e78d 100644
--- a/meta/recipes-kernel/linux/linux-yocto_6.16.bb
+++ b/meta/recipes-kernel/linux/linux-yocto_6.16.bb
@@ -77,3 +77,7 @@ KERNEL_FEATURES:append:powerpc64le = " arch/powerpc/powerpc-debug.scc"
 # Check again during next major version upgrade
 KERNEL_FEATURES:remove:riscv32 = "features/debug/debug-kernel.scc"
 INSANE_SKIP:kernel-vmlinux:qemuppc64 = "textrel"
+INSANE_SKIP:kernel-vmlinux = "buildpaths"
+INSANE_SKIP:kernel-dbg = "buildpaths"
+SRC_URI += "file://rust.scc"
+KERNEL_FEATURES += "rust.scc"


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# Randy MacLeod
# Wind River Linux
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