Re: [OE-core] [PATCH] rust: Upgrade 1.92.0 -> 1.93.0

[Harish Sadineni <Harish.Sadineni@windriver.com>]

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On 2/2/2026 8:45 PM, Yoann Congal via lists.openembedded.org wrote:
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> Le dim. 1 févr. 2026 à 08:52, Mathieu Dubois-Briand via 
> lists.openembedded.org <http://lists.openembedded.org> 
> <mathieu.dubois-briand=bootlin.com@lists.openembedded.org> a écrit :
>
>     On Fri Jan 30, 2026 at 2:41 PM CET, Hemanth.KumarMD via
>     lists.openembedded.org <http://lists.openembedded.org> wrote:
>     > From: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>
>     >
>     > https://blog.rust-lang.org/2026/01/22/Rust-1.93.0/
>     > Rust changes: https://github.com/rust-lang/rust/releases/tag/1.93.0
>     > Cargo changes:
>     https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-193-2026-01-22
>     >
>     > * rust-oe-selftest.patch updated for 1.93:
>     >   Renamed UI test directive from add-core-stubs to add-minicore
>     as in
>     >
>     https://github.com/rust-lang/rust/commit/3796f7de57f5d4cf4325d1f13aeb07fdaa57983b
>     >
>     > * OE-selftests:
>     >   - Exclude src/tools/remote-test-client from test suite.
>     >     This unit test modifies the TEST_DEVICE_ADDR environment
>     variable,
>     >     which breaks the OE test harness that uses the same variable for
>     >     QEMU remote testing. Filed a bug with upstream:
>     > https://github.com/rust-lang/rust/issues/151823
>     >
>     >   - Enable +v8a feature for cortexa57.
>     >     Rust 1.93.0 added a regression test (PR #149549) to verify
>     that the
>     >     ARMv8-A system register ttbr0_el2 is recognized in inline
>     assembly.
>     >     This addresses issue #97724 where LLVM wasn't recognizing
>     ttbr0_el2
>     >     as a valid register. Upstream Rust enables +v8a by default
>     for all
>     >     AArch64 targets (PR #105026), but Yocto's custom target
>     specification
>     >     doesn't inherit this. Adding +v8a ensures LLVM recognizes
>     ARMv8-A
>     >     system registers, fixing the test failure.
>     >
>     >     Related upstream links:
>     >     - PR #149549: https://github.com/rust-lang/rust/pull/149549
>     >     - Issue #97724: https://github.com/rust-lang/rust/issues/97724
>     >     - PR #105026: https://github.com/rust-lang/rust/pull/105026
>     >
>     > Test results:
>     >
>     > rust v1.93.0
>     > +-------------+--------+---------+
>     > | Machine     | Passed | Skipped |
>     > +-------------+--------+---------+
>     > | qemux86-64  | 21,689 |   646   |
>     > | qemux86     | 21,439 |   896   |
>     > | qemuarm64   | 21,495 |   840   |
>     > | qemuarm     | 21,421 |   914   |
>     > | qemuriscv64 | 21,466 |   869   |
>     > +-------------+--------+---------+
>     >
>     > Test results difference (1.93.0 - 1.92.0):
>     >
>     > +-------------+--------+---------+
>     > | Machine     | Passed | Skipped |
>     > +-------------+--------+---------+
>     > | qemux86-64  |  +205  |   +33   |
>     > | qemux86     |  +205  |   +33   |
>     > | qemuarm64   |  +206  |   +32   |
>     > | qemuarm     |  +205  |   +33   |
>     > | qemuriscv64 |  +205  |   +33   |
>     > +-------------+--------+---------+
>     >
>     > Signed-off-by: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>
>     > ---
>
>     Hi Hemanth,
>
>     Thanks for the upgrade.
>
>     I suspect this is responsible of the
>     runtime_test.RustKernel.test_kernel_rust_sample selftest failure:
>
>     2026-01-31 16:20:41,991 - oe-selftest - INFO -
>     runtime_test.RustKernel.test_kernel_rust_sample
>     (subunit.RemotedTestCase)
>     2026-01-31 16:20:41,994 - oe-selftest - INFO -  ... FAIL
>     ...
>     ERROR: linux-yocto-6.16.11+git-r0 do_compile: Execution of
>     '/srv/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-766138/tmp/work/qemux86_64-poky-linux/linux-yocto/6.16.11+git/temp/run.do_compile.189616'
>     failed with exit code 1
>     ...
>     | error: unknown unstable option: `no-jump-tables`
>
>     https://autobuilder.yoctoproject.org/valkyrie/#/builders/35/builds/3127
>     https://autobuilder.yoctoproject.org/valkyrie/#/builders/48/builds/3022
>
>     Can you have a look at what is going wrong here?
>
>
> Hello,
>
> To clarify because this is not totally obvious:
> This test is defined in the "[PATCH v5 00/15] Enable rust support for 
> linux kernel" from Harish.Sadineni (also at Windriver)
> https://lore.kernel.org/openembedded-core/20260129163910.2612040-10-Harish.Sadineni@windriver.com/
> So, the test is not present on master (or even master-next).
Hi all,

"[PATCH v5 00/15] Enable rust support for linux kernel" this series is 
taken to mathieu/msater-next, on top of this series when testing with 
rust-1.93.0 patch
has caused this build failure.

This failure is already identified in upstream and has a fix in 
linux-kernel 6.18/master, so i will send a backport fix to linux-yocto 
v6.16.
https://github.com/torvalds/linux/commit/789521b4717fd6bd85164ba5c131f621a79c9736

Can the rust 1.93.0 patch be tested/merged , By the time above mentioned 
backported patch taken to linux-yocto v6.16?.
>
>
>     Thanks,
>     Mathieu
>
>     -- 
>     Mathieu Dubois-Briand, Bootlin
>     Embedded Linux and Kernel engineering
>     https://bootlin.com
>
>
>
>
>
>
> -- 
> Yoann Congal
> Smile ECS
>
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