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

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

On 2/1/2026 1:21 PM, Mathieu Dubois-Briand via lists.openembedded.org wrote:
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> On Fri Jan 30, 2026 at 2:41 PM CET, Hemanth.KumarMD via 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?
Hi Mathieu,

This issue was already identified in upstream when building linux Kernel 
with rust-1.93.0, They have taken fix to linux kernel v6.18/master.
But it is not present in linux kernel v6.16:
https://github.com/torvalds/linux/commit/789521b4717fd6bd85164ba5c131f621a79c9736

To address this, I will submit a backport of the upstream change to 
linux-yocto v6.16/standard/base.

Thanks,
Harish
>
> Thanks,
> Mathieu
>
> --
> Mathieu Dubois-Briand, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>
>
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